I recently bought a 1987 Hobie 17, and am trying to install a replacement Trampoline that I purchased through Murrays.com. I don't know how to remove the old vinyl tramp, or, put on the new three piece mesh one. There doesn't seem to be any place in the cross bar channel track to start inserting the edge of the tramp. Do you grind open an entrance point in the cross bar, or loosen the cross bars to gain access to the channel entrances? If anyone knows the best way to install one of these, please help. Thanks