Shoulder bolt is garden variety hardware in mcmaster and other machine
tool catalogs,
Shank is machined, end threaded and with cap allen driven heads; a
million sizes.
Has no bearings associated with it.
Traps lifts on fence and table top. Lifts are slotted, and slots hook
on the bolt, trivia.

Dial indicator monitors micro fence adjustments, 1.00" worth. It does
butt up against a round stop.
If the stop is located on the same center as the spindle on the dial
indicator it reads quite well and to the nearest .001", not difficult
to do with medium drilling and indexing skills. Can spin and still
read the same, flat stop would not.
Why round? Balances the hardware ensemble, it is part of the design
and it works.
Thank you for your interest.
http://www.patwarner.com (Routers)
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I read you page about adjusting cutter height (good stuff) and see a photo
and ref to a shoulder bolt. I could not find any other ref to the bolt on
your site nor could I find a photo that shows how/where it is attached or
what it does -- other than hold the 1/4" mdf pieces in place. Also, the
"bolt" in the photo looks like it has a bearing at the top. So, can you
offer more info? Does the bolt serve to hold the stock to the fence at all
-- it looks like it might in the bottom photo on that page?

BTW, why do you have (what appears to be) the dial indicator pin on your
fence pressed against a round object rather than a flat surface at the back
of the fence?

-- Igor