67 TTL Prism

Replacement foam around the lower perimeter of the TTL prism is a compress-fit once new. It has to be like that. I replaced the foam of my prism 3 years ago, and once in a life time is quite enough! Over time, the compression will wear down (removing and reattaching the prism very often will decrease the compression). A very firm push down until the tell-tale clicks are heard should be sufficient. But replacing the foam is a ghastly sticky chore involving fingers, blades, Q-tips, alcohol, tissues, tears and some novel swear words... a whole range of ever-increasing implements and requiring a lot of time.

Problem is getting it compressed enough to lock. I wouldn't want to do a replacement of the foam. I can imagine what a PITA it is.

UPDATE-I finally achieved success. I kept compressing the foam and pushed as hard as it would go and it finally locked. I took it outside and the meter is spot on with two other meters I have. I'm going to leave that prism on the camera a couple days and hopefully it will be easier if I have to use it again.