The release pillar fabrication is used to pivot the micrometer shaft and locate one end of the return spring.
What we're looking to make is as below:-
This assembly consists of two parts, item 53 and item 16 soldered together. Remember item 16, it's used in lots of places!
One Brass Release Pillar, Item 53:-
To do a really good job, you will ream the 4mm hole having initially drilled it to 3.9mm, using the 4mm reamer shown in Special Tools. When using this reamer, only use low speeds and feeds, awhile withdrawing frequently to clear chips. Personally, I felt that it was unnecessary when making this part.If you make it as drawn, you will probably break through around the 4mm hole into the rebate cut at the right hand end of the pivot trunnion. If it occurs, you've positioned it correctly! It's not good design, but space was so tight I couldn't do anything else.
You need one silver steel Retaining Pin, Item 16:-
While you're making item 16, you might as well make 9 more that are required later, and 6 off Item 17 that are required elsewhere.
Then you must silver solder them together using item 79 (sorry about the spelling of 'release'):-
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