Anyone have any good ideas on how to loosen up the rails for the Mountain Horse gas can? I used it last year and it was a little tight, but usable. This year I can only get the gas can to slide onto the rails by whacking it 50 times with a rubber mallet -- there's no way I can get it on or off by hand. I'm thinking that I'll probably get rid of the rails and just try to figure out a secure way of strapping it down instead. But I'd like to use the rails if I could. Any tips would be appreciated!