This is pretty simple I just used a few piece's of shrink wrap cost around a buck. I got some that where close to the size of the spring. I used a pair of needle noise to strech the wrap a bit to fit over the spring. I also cut it into two pieces to make it easier.
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I used a heat gun the shrink it on there, you could use a lighter or what ever.
The tighter your chugging... well... I've got nothing, but this will help tighten my chugging, so for that, i thank you.