Repro no 32 mk ii sight problem

[jr57]

Hello, I've fitted one of the above to my no 4.

To my dismay I've discovered that I've no adjustment for elevation. Turning the lead screw does nothing. The windage works ok though.

Trying to get this thing adjusted to zero is a right b******! although surprisingly I did actually manage to zero it as the elevation didn't need adjusting.

I've also noticed that the drums tend to lock up and won't turn their full range of movement when the lock rings are tightened.

I'm just looking for help and advice and if anyone has experienced similar probs with these repros and if its easily remedied !!!! I fear not.

In anticipation.

Information

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[Peter Laidler]

I have never had one of these things apart but I knew that Warren on this forum has had dealings so maybe he'll come in here.

BUT, if you have no range adjustment, it seems to me as if the lead screw nut part of the diaphragm assembly has unscrewed from the leadscrew.
As for the drums locking up when you clamp-up the lock rings (can I assume that you mean the lead screw locking rings as it's a Mk2 variant?), well, I might sound a bit glib here, but my advice has always been - well don't do the buggers up tight then! If you are well forwards on the advance into Antwerp in 1944, then tight is fair enough but if you are shooting at targets for fun on a well manicured range on Salisbury Plain in 2012, then your lead screw clamping nuts only have to be tight enough to lock the lead screw. Nothing more nor less. I have seen them tightened down like Jumbo jet wheel nuts

[Warren]

Regarding the repro 32 scope, JR57....drop me a private email and maybe I can walk you through it. I've had a few with jammed adjustments and they can sometimes be a real bugger to correct. This is the reason I like to go through them first.
Anyhow, drop me a pm with your email.
Cheers,
Warren

[Surpmil]

You'll probably find the critical dimension is the length of the round projection on the bottom of the drum to which the index plate is screwed by three small screws - were they 8 or 10 BA, I forget?

There is no built in adjustment so the parts must either be very precisely dimensioned or hand-fitted, which means lapping either the back side of the index plate or the bottom of the projection on the drum, or both, until with the screws tightened, the drum just turns smoothly, without slop or binding.

If turning the actual lead screw rather than the drum does nothing, then either the locking ring is very loose, or something is dramatically wrong inside the scope.

All that is predicated on the repros being made to the same design as the originals, and I have no idea if that is the case.

[Peter Laidler]

Let us all know what the answer is Warren then we can all learn. But I have often thought of substituting all of the repop optical system with the optics from a No42 or 53. At least that way, you have a degree of standardisation. The down side as I understand it, is that it's not the repop optics that are the problem - it's the mechanical parts in the turret area!

[jr57]

Ok everyone, thanks for your inputs. Hopefully with Warrens assistancei'll get it sorted but I have an impending sense of doom regarding this.

Hello, I've fitted one of the above to my no 4.

To my dismay I've discovered that I've no adjustment for elevation. Turning the lead screw does nothing. The windage works ok though.

Trying to get this thing adjusted to zero is a right b******! although surprisingly I did actually manage to zero it as the elevation didn't need adjusting.

I've also noticed that the drums tend to lock up and won't turn their full range of movement when the lock rings are tightened.

I'm just looking for help and advice and if anyone has experienced similar probs with these repros and if its easily remedied !!!! I fear not.

In anticipation.

[Warren]

I've contacted jr57 and once we find out what manufacturer of scope he has; there are apparently more than one maker and it seems each has it's own little foibles, we will do a running commentary on a fix.
Just wanted to add the following bit of a warning to those with repro scopes and repro mounts
One of the MAJOR problems with the repro scopes appears to be mounting the scope on the repro mounts. The mounts are not checked with any sort of gauge for the size of the aligning slot in the mount. When the purchaser of the repro scope and repro mount forces the scope into the mount with the cradle cap screws the turret assembly breaks loose and then the fun begins. Instead of relieving the slot some seem to think that the brute strength of the cap and screws will seat and the scope and seat it it does, however at the expense of the scope. I've had to relieve about 50% of the repro scope/mount combinations I have assembled for people. In the last few months, I've already repaired a number of scopes where the turret assembly has been broken loose of the tube and it is not a nice job to repair. Some of this is caused by the mount from one supplier and the scope from another looking for the cheapest buy. The repro scopes have several components that are Loctited (tm) together so without the correct wrenches you can begin to see the problem already just to disassemble the scope. Worse than the dried and hardened mastic on the Mk. III ocular cell.
to be continued.......

[Norton1]

Let me assure you Warren that you are an indispensable person on this space in time.

I can attest to the above being a fact - and it does not take but a small bit of tightening to wreck one. Ask me how I know - - -

[Peter Laidler]

Am I missing something here with the diametrical configuration of the repro scopes and mounts?
Is it that the 1" diameter of the tube is incorrect
or that the 1" diameter of the bored hole in the cradlke and caps that it incorrect or just out of alignment that is crushing or distorting the tube

Surely, if the geometry of the 8x taper lock cradle cap clamping screws and corresponding holes in the caps is correct, then you physically CANNOT overtighten them beyond a minimum torque (I forget what it is now - 5 or 8 ft/lbs? - have to look in an old Machineries handbook.......) that is insufficient to crush the tube as the screws will lock up in their own taper.

Any chance of some pictures of your damage Norton?

Or am I going off the subject into a non related area?

[jr57]

Ok the repro I have is from Numrich.

Regarding the repro 32 scope, JR57....drop me a private email and maybe I can walk you through it. I've had a few with jammed adjustments and they can sometimes be a real bugger to correct. This is the reason I like to go through them first.
Anyhow, drop me a pm with your email.
Cheers,
Warren