Some time back I saw a post on an aperture sight that fitted on the bolt stop of a mauser rifle(this is not the cocking piece sight). I was telling a friend about them and asked for more information but I can't remember were the thread was. Any others know about these sights as I would like to pass him some more detail.

tincup had a bunch of pics. I save 2 of em.

Thanks Rich, that is exactly what I was looking for.

One place to put it, I guess, hopefully not jarred every time you work the bolt or moved when you remove it.

A worse danger is the cross arm, which I regard as too delicate since my son accidently bent down the one on our Lyman 66. Were I to get another peep with a cross arm, I'd have the arm drilled and tapped for a stop screw on the outer side to support it once zeroed.

Here's another picture, though not as useful as Tincup's.

Usefull or not, it is a treat to see. Thanks for posting it. I have passed on the relevant information to the friend who was looking for alternatives to the bridge mounted units.

Anyone making a repro of that Lyman 35?

Here's an Oberndorf sporter with the Lyman sight in a Guns International listing.
Online Listing