I'm looking for Al Stohlmans book "Making Leather Animals. I saw a post reply from you offering to email a copy. Can/Are you still willing too ? If so please send me one at.......... rawhidebraider64@gmail.com
In Australia if you go to JAYCARS they sell heat shrink with a heat activated glue, they call it double skinned - {I think}, when you use it the glue melts and solves the problem of the tubing sliding off
Use the shick injector blades they are much better
But the best is something like this
https://www.etsy.com/uk/listing/257475163/angular-skiving-knife-vergez?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=skiving knife&ref=sr_gallery_2