Not 100% certain so take it FWIW.

by Hoot , Diversityville, Liberal-sota, Saturday, June 06, 2015, 08:08 (3462 days ago) @ Paul

I *think* that sight will work on an OM. I do know the Flattops used a Micro rear which had a round 'tang'.

The pivot pins are tiny. I modified a 1/16" punch with a hand drill and sandpaper so that it would clear. Don't know if my punch was oversized or if it's a necessary thing.

Haven't been to the Dungeon yet...I'll get back to you shortly.