Coincidentally, after reading this thread lst week I managed to drop my large tank in the dark and break the red rim. It will not be repairable.
So I looked on our favourite auction site and found a new, 5 (35mm)/ 3 x 120 reel tank - complete with 5 reels for 26 quid.
There's nine left. Link:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=230627096043
Hope of use.
Niall