Husqvarna 455 rancher rotating bar bolt. How do you fix it. model 2002-00

This is not good, and not easy to fix, the bolt is an interference fit in the composit crankcase, there is a square on the back of the bolt that fits into a moulded opening on the inside of the tank, if this square has destroyed the bolt will just turn, all you can try to do is increase the interfernce fit in the tank and hope this will hold enough to tighten the nut, to do this drain the oil tank, tap the bolt from the ouside pushing it into the tank, shake the bolt out of the filler hole, take a centre punch, and punch the shank of the bolt where it sits in the tank, this will slightly increase its diameter, if you have a frendly engineer, have him knurl the shank, make a small mark on the thread at what will be top dead centre ( this will aid getting the squre in the correct position ) thread a piece of thin wall tubing, or thin wire through the bar hole and out through the filler hole, connect it to the thread of the bar bolt, and carefully pull it in, once the thread comes though to the outside of the bar pad, turn it with your mark at top dead centre, now use a nut and a spacer to pull the bolt in, you could use some adhesive on the shank as well, sorry this is a bit drawn out, but it would realy need a new tank.