Hi all I have a comet GT 125 I'm doing up to use as a runabout in the town can anyone tell me how to get the two down-pipes away from the heads, Ive undone one bolt on each pipe at the head, however theirs no bolt on the other side of the flange just what looks like a domed rivet, , can anyone tell me if this is just a push in type fit or do i need some kind of special tool to undo it. And before anyone starts to take the mick about hyosung's and it being crap, the whloe bike done up and looking like a nice thing will only have cost me £250 not bad for a 03 plate