I used them when I would tear up my practice arrows. I found them to work well and last. I do not have a fletching jig, so this really helps when you tear up a few practice arrow vanes.
The key is to make sure the water is almost at a boil and get the shrink rap to shrink tight. If you do not have the water hot enough or leave in the water long enough the shrink rap does not get tight enough.
I put the arrow in the water for a couple seconds to start the process, then I take them out and twist the vanes to set the helical. I then put them back in the hot water for another 15 seconds or so. I let them cool off and then check to make sure they are very secure.
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