Like Rob said,you need to try them out.What I do for my carbon tuning,I tune them without gluing in the inserts.I'll take the insert and push it in with alittle saran wrap to hold the insert in snug.But you need a softer bag target not a foam target.The saran wrap holds the insert in snug and the bag target doesn't grab tight enough to pull the insert out on removal.After I have experimented and tuned them to my satisfaction,I'll then clean and prep the shafts for installing the inserts.I get my carbons tuned without gluing or using any heat on my carbons like trying to tune with a hot melt.I just don't like to apply any heat to carbons.