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@Thankshallots
Normally you only want the heart shrink to be 25% bigger than what your diameter you want to cover is, your rope will compress as well. Most common are 2:1 and 3:1 ratios. You also need to bear in mind that heat shrink shrinks down and in, thinner and smaller. I've got tubes up to 10mm or then 40. Rs is a good place to get some.