The way I tuck under is first make a tucking tool I flatten a copper pipe on one end file one flat corner off so it doesn't dig in then fold the other side over so you have a wedge shape with a round corner on thinnest side but still keep the pipe round on Handel to hold, then (im right handed so always work right to left ) bend vinyl over with left hand just under capping lip while holding pipe in right hand tuck under and slide so it pushes capping open using the wedge shape the vinyl will pop under capping then using side of right hand it pushes vinyl flat if that makes any sense to you its how i do it and ive confused myself writing it a 2 metre length can be tucked in about 4-5 seconds with no heat
