Need screw thread pitch for a Parker Hale PH5b windage screw

All--
I am looking for the screw thread pitch for the windage screw for the Parker Hale PH5B rear sight. Anyone have that information?

Cheers

--fjruple

Parker Hale screw threads were in a world of their own I'm afraid to say and differed according to the mystic tides of the ancient mariners writings. The only rational explanation I have ever fathomed out, from the experience of a late friend is that by ensuring that threads remained different according to their sacred and mystic charts, when anyone wrote in ordering a new screw or nut or part or just advice, they could send a standardised letter back stating the bleedin' obvious - with a hefty financial sting in the tale. And that was worded to the effect that these things are individually hand made using specialised Craftsmen who this that and the other and blah blah blah - and factory service and repair are the only true course of salvation and redemption for owners of such beasts.

They were matched up to the peep hole sight with 1/4 minute movement.
Threads were the same for the 5B and the 5A which were bespoke to that particular sight.
I will look to see if I have anything on the threads for you and get back, I am sure there will be something recorded but it means reading through the archive.;)

Have you LOST the screw or have you broken the part off that attaches to the thumb wheel part? That's generally the part that snaps off when the rifle falls down and that can be an easy fix............

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Originally Posted by Peter Laidler

Have you LOST the screw or have you broken the part off that attaches to the thumb wheel part? That's generally the part that snaps off when the rifle falls down and that can be an easy fix............

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Peter--

I have the screw but as you stated the windage knob broke off and is missing. I was having trouble determining the thread pitch so I can get an easy replacement to work with. In the end run I will probably have to machine a new windage screw. I have a friend that has a micro-lathe for making small parts and he can chase down the thread to duplicate the windage screw. The micro-lathe he has is interesting in that it belong to a model train company that built electric toy trains under the American Flyer brand name.

Many thanks for your help. Cheers

--fjruple

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Originally Posted by fjruple

I was having trouble determining the thread pitch

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Do you not have a thread pitch gauge? A good one should have all the applicable threads? Even strange ones?

Or better still, bore into the existing thread. Now get a suitably threaded shaft, machine one end down to the diameter of the hole and soft solder* this new threaded shaft into the existing one. Cut to length. Now all you need to do is to machine a new thumbscrew head and thread that to the thread you've just inserted into the old lead screw. New locknut and you're home and dry. I did that to resurrect quite a few needy P-H sights at my sons old school (after being told many years before that they all needed to go back to P-H for repair by their expert craftsmen)
*soft solder means that you can always release it and start again. Unlike fixed-for-good compounds

Peter, That'll do it nicely.;)

Quote:

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Originally Posted by Peter Laidler

Or better still, bore into the existing thread. Now get a suitably threaded shaft, machine one end down to the diameter of the hole and soft solder* this new threaded shaft into the existing one. Cut to length. Now all you need to do is to machine a new thumbscrew head and thread that to the thread you've just inserted into the old lead screw. New locknut and you're home and dry. I did that to resurrect quite a few needy P-H sights at my sons old school (after being told many years before that they all needed to go back to P-H for repair by their expert craftsmen)
*soft solder means that you can always release it and start again. Unlike fixed-for-good compounds

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Peter--

You gave me a better idea. I have access to a micro-laser welder and It can do the same as you suggested.

Many thanks

--fjruple