My Bell and Howell had its take-up reel come off the little pin/screw that goes through the reel, causing it not to take up film. I lined everything up and got it back on the screw but it keeps working its way off pretty quickly. Looking under the cap that goes over the middle of the reel, I am wondering if there is supposed to be a lock washer or something on there to keep the reel from sliding off its pin? The pin is pretty small (a little over 3mm) so I could have lost the washer if there was one.