So, briefly, my TiGlow endured about a month of frequent keychain carry. One day I dropped my keys in the grass and that was it - trit busted. Not sure how it broke, but the most likely cause I suppose would be something on my keychain striking a portion of the exposed tube.
btw - I should have my Norland 61 procedure posted by tonight (hopefully!). As for the silicone tubing, I believe I can be of assistance should anyone be interested. So long as interest is fairly limited, I don't think I'll need to collect any payment - this will be payback to the community.