This is just a little report on my today's short project of replacing the light seals and mirror damper on my Canon FTb. Going over various web pages, I short listed the following materials: 1. Foam to replace the mirror dampler. Readily available at craft hobby stores. The pack contained number of sheets, and some of them seemed to vary in thickness by an mm or two. I selected the one which seemed 2mm thick. $6 for a bunch of a number of sheets (this is in Montreal, Canada, btw). 2. 100% pure wool. Some web pages recommend to get 8 ply, but all I got was Medium weight 4 ply black wool. 3. Felt. Readily available at craft hobby stores. 4. Adhesive. I used two: Lapage's Flexible plastic adhesive and Scotch's Quick Dry adhesive (this one is acid free). The former I used for the mirror damper and the latter for the back door seals. I was planning to use the former for all of these, but gave the latter a try just for the heck of it. People usually recommend rubber cement as an adhesive (not sure how it compares to these though). 5. Naphtha (to clean away previous glue and decomposing foam). 6. Tooth picks (to clean away previous foam). 7. Ear buds (to apply naphtha). 8. Box knife and scissors. Step 1: The most difficult step: to wet the previous foam with naphtha and to remove it. The more care was needed while removing the mirror damper for fear of damaging the focusing screen. The long seals on the back were relatively easier, and the felt foam near the winding crank side was so so (since I did it without removing the back door). How to clean these is explained on many web pages. Just make sure one does not use too much naphtha. Step 2: Install mirror damper. I cut a strip of foam that was round 2mm thick, 35mm wide and 3mm deep. Applied some plastic adhesive in small dots across the width of the base and placed the strip on it and pressed it a bit. Next, I also cleaned the lower edge of the mirror, which has all the decomposed gooey foam on it from the previous one. This was done by dabbing it with an ear bud doused in naphtha. In this step I also discovered that the mirror is quite tough. I had to brush the foam off with ear bugs and then cleaned that edge of the mirror with lens cleaner tissue (moistened with naphtha) followed by a final tissue cleaning. All this was done only on the few mm's where the older goo was sticking. Step 3: Cut a 5 mm wide by 5.1cm strip of felt and pasted this outside the hinge on the winding side. This was stuck using the quick-dry adhesive on strip's two ends only. Step 4. The thin ridges across the back were the last to be done. These were done by sticking a length of wool yarn across them. I just stuck one end of the wool first, then twisted it a bit to make it fit the ridge, and kept inserting it using a plastic coated paper clip and continued toward the other end. Reaching that end, I cut off the yarn at the appropriate length and pasted that end with the adhesive as well. The top ridge was a bit tricky, since this was done in two lengths to get a break at the place where the frame counter reset lever protrudes from the body. That is it, the camera's back door now springs back like new and all the goo is gone. I am very interested to see how wool behaves as time passes. Also, whether I will run in to some problems by pasting on only ends of wool and felt to the body and not their entire lengths. Plus, all this was done quite economically. Most of the stuff I already had in the house. All I needed was to get the foam and felt from the hobby store. Plus, with the material left over, one can do numerous number of cameras with it! I am also playing with the idea of pasting a strip of valour (or velvet) on top of the mirror damper. Wonder if this will make the mirror a bit quieter. If the foam can be replaced by felt, that might even be better (foam is kind of iffy given the way it degraded with time and environmental factors). I did not replace the four felt strip that are pasted on the door. They appear to be okay. I will shoot a roll and see whether are any problem. That is it, folks. Questions are welcome.