Tim, I would advise the use of paraffin not petrol. (Paraffin oil based) then pop ya tin of grease on a camping stove until it turns from solid into liquid, place chain in said runny substance turn stove off then as the grease starts to solidify pull chain out and hang from one end. Ideally over the tin let excess drain into tin, once fully set take chain down and pop onto ones steed (or motorcycle) if one prefers. OR one could just go n buy one o them there newfangled O ring jobbies. (I highly recommend a decent quality one) Either way besto luck, oh and make sure one has plenty o them there latex gloves handy. It can turn awful messy. Either way best o luck. Cheers. Michael