Snap On Micrometer - Disassembly and repair

[Donka22]

Hello all, I got this mic in a lot of shop calipers, etc and it sort of works, but i would like to repair it or see what caused it to malfunction
Symptoms: opening the thimble out, the last number skips and jumps. goimg in it seems to "count". I dont know who made it for Snap On, but it looks like Starett by the clutch , possibly B&S , and unlikely a Mutitoyo. The counter mechanisms are sometimes made by a specialty co. like Veeder Root for the OEM, but im guessing,
I cant see any setscrews. there is a plastic plug on the counter body, but its likely an oil port or cleaning plug. It wont come out either. There is no drag/resistance to the anvil or friction similar to feeling like a jam in the threads.

If anyone has fixed these or knows where a diagram is, please post a link, thanks

 

[RoninB4]

-My brief search yielded nothing. I'd contact Snap On for more definitive info. I've held/used a lot of mic's but not one of these.

 

[RTM]

If it is a Starrett they do have 3d parts breakdowns on their website. You might need to be a member to get access.

 

[senlow]

The counting mechanism looks the same as the J.T. Slocomb SpeedMike.

I repaired a couple of Mitutoyo "mechanical-digital" micrometers years ago. It was a pain in the *** and I never want to do it again. Unfortunately, I have no technical information to share. Good luck with your project.

 

[RoninB4]

I repaired a couple of Mitutoyo "mechanical-digital" micrometers years ago. It was a pain in the *** and I never want to do it again.

-I purchased one of those in the early 80's and retired it soon after getting it for fear of needing to repair it. It still works fine but the likelihood of crud fouling the counter mechanism caused me not purchase any type of digital mic after that.

 

[NHtoolguy]

I have a vintage SpeedMike with a similar mechanical display mechanism. It still works, but I don't use it hard. Like so many older companies, J. T. Slocomb has ceased operations. There is likely to be service information somewhere online. Perhaps query Practical Machinist.