I show you how easy it is to remove and service the foam-damaged prism on OM1, OM1n, OM2, and OM2n. You just need the right tools, patience and little bit of your spare time.

Tools needed for this job (or to service most Japanese film cameras):

Lens Spanner Wrench (this is the best one I can find): https://amzn.to/3fWpoUO

Crosspoint Screwdriver Set: https://amzn.to/32fRFT3

Tweezers: https://amzn.to/3piB0XL

Compass: https://amzn.to/3qeIdap