Lou, yuh i moved it so the stopper is push into the firewall, i cut a hole in the firewall for the stopper, i made 2 cross beams out of a bit of triangle ply the with 3mm ply i used that as my floor i had to cut a fair bit of wood away from the fuse so i could get the tank in there and had to relocate the hardwood blocks for mounting the cowl, then i used some velcro and some spounge to hold the tank nice and firm and then i put a bit of wood behiind the tank just incase it wants to move.
but i really think this tank had to be pushed to the front, because it was way to far back for a glow engine.