Stokie wrote:Fcuk - that's gonna hurt !
not much measuring 8" or more around here mate

got the pipe [probably enough to have four goes at it, for a tenner cash], smoothed it inside with some emery on a long drill bit, tidied up the flanges, so now [with some heat] the pipe can slide down reasonably easy.
next I about to pack the end, some metal mesh round the tube [to stop the wadding being blown out], then the wadding [loft insulation], but not too much, and wrap some aluminium tape around it to keep it in place when I slide the can down...