Hi Ann. Been there done that. A lot of fun. I simply took some 1/2 wide scotch tape and wrapped continuously on an empty spool at both ends until I had plenty of "build-up" on either end. The 35mm then fits nicely in the middle. You have to spool and load in the dark of course. The image all the way out into the spool holes is a very neat effect. Look out Hassy X-Pan.