How to disassemble a micrometer

[Enfield trader]

rear sight help. I have a No4 micrometer rear sight and the clicks are not positive. I'd like to take it apart, good idea or not? Directions / pics would be very nice.

Information

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[jmoore]

Another bit of tech previously dealt w/ by Captain Laidler. Also on the old, old Jouster. (I seem to remember something about doing the work INSIDE a plastic bag to keep from losing the tiny parts...)

Anybody got the post squirreled away?

[browningautorifle]

I don't, but if you study an exploded drawing first it may help.

[Mk VII]

You have to punch out the little pin that holds the screw in place. Some will come out, some don't want to move.

[madcratebuilder]

Looking at the front you need to drive out the pin on the upper right side. It's just below the adjusting screw. I drive them from the back side, not sure if that's the approved method. Remove the pin, remove the adjusting screw and the spring and plunger pop out and fly across the room. You spend the next hour with a magnet looking for those two tiny parts, swearing to use a plastic bag next time.

[burgie]

I have these in my files:
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by TBonesteak:

There's a very small pin in the top of the sight next to the "clicker"(elevation adjusting knob), this engages in a depressed ring in the top of the elevation adjusting screw/metal thread. When that's removed you can wind the elevation adjusting screw out of the bit with the apature in it, and out of the sight. Be careful not to lose the plunger and spring, or plunger and bearing that are housed just on the other side of the pin you first drive out, these also sometimes need to be depressed a bit while you remove the elevation adjusting screw, as it may foul in the depressed ring in the top of the elevation adjusting screw/metal thread, and thereafter the threads.
What sort of 100 meter mod do you need to make?
It might be a better idea to put in a slightly higher foresight if the problem is that it won't zero at 100.
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by Peter Laidler:

Here's a tip for all of you wanting to take the Mk1 sight apart. Do pretty well what TBonesteak has said BUT:

Get yourself a largish polythene bag and wrap the open end around your right wrist with an elastic band. Now cut a wrist size hole in the other end. Once you have driven the cross pin out, don't do ANYTHING ELSE EXCEPT put the sight inside the bag together with yoiour left hand. NOW take it apart because no matter how careful you are, the ball or plunger WILL come whizzing out and you WILL lose it.

Assemble in the same way but use a big dob of grease to hold it all in place. But at least when it does whizz out the first, second and third and more times, it's still there!

When you've done it a zillion times you can do without the poly bag. You always knew when an Armourer had lost one because it was always followed by the words 'bolloxxx' which I understand indicates 'Oh, deary me, I'm losing my patience.......'

Anyone got a source for replacement balls. If I remember correctly, they are the same size as model railway wheel bearings. They certainly don't use many in my Centurion

[Edward Horton]

Before you try and dissemble the sight try soaking the sight in kroil, penetrating oil, WD-40, kerosene, paint thinner etc, this should remove any dried petrified cosmoline and dirt.

[Enfield trader]

The sight in question does not have positive clicks, either by sound or by feel.

[madcratebuilder]

The sight in question does not have positive clicks, either by sound or by feel.

The plunger and spring may be seized or missing.

[Edward Horton]

The plunger and spring may be seized or missing.

This is WHY I said soak the sight in kroil, penetrating oil, WD-40, kerosene, paint thinner etc, to loosen the plunger and spring. Or did you think I was just oiling the threads on the adjusting screw.

Soaking the sight in penetrating oil should have been the first posting BEFORE giving instructions for taking it apart (If it ain't broke don't fix it)