Tambour was invented by the devil
I've reached the end of my patience with trying to replace/repair the rotten tambour under the sink in my '72 International. The PO said he couldn't do it, either, and he was a mechanic! The replacement material should have worked great, but it buckled, bound up, and popped everywhere along the track. What's worse, the veneer on the outside began to split and crack off after only a few pulls. I tried greasing the track and it bound worse than ever. One good pull and the tambour ripped apart like cardboard (no surprise--that's what the backing is!)
I think I'm going to replace the whole thing with a straight-dropped piece of shower curtain in a nice seashore print and forget that I ever heard about tambour.