I was shooting at the end of my roll, and since I often get more than 36 exposures I was not concerned when passed 36. However, when I tried to rewind the film it dawned on me that the film end is no longer attached to the canister and I can't rewind it; the canister simply spun freely and the film on the right didn't move. I am for the first time in this silly situation so I went for help to a commercial photo service where I develop, but there I was told they don't do that sort of service (to put the film back into the canister). Instead I had to buy a new canister which they assured me will stay light-tight. The question is, can I attach the film end and rewind the film into the new canister? Can I use any specialist light source during the procedure (colour negative) ? Any advice or tips will be much appreciated.