Do You have a beefy line flaring fixture You can clamp in a vice? I've taken sleeves/collars & had the fixture set open-end up, pre-set to allow it to drop in to the best fitting size & the swing hinged end able to clear once the sleeve is in place.......have the cable supported & in position to grab & hold easily, torch the sleeve hot & get it just going orange then drop it in the fixture, close the swing end & put just enough pressure to keep it there. Insert the cable to the needed depth & crank those things tight, I give it a few raps w/a ball peen, & tighten again, 'till it feels like it quits givin'. Yank it out & quench it.