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The longer m5 heat set inserts are usually narrower than the short ones for some reason. You will need a deeper 0.3mm narrower hole to fully engage. You can try a couple of things. If you mush the last 3mm of the longer insert into the shorter hole, it may melt enough plastic to lock it in place. You can also try printing a thin plastic insert ring and melt locking it in place. Another option would be tape over both ends of the insert, put it in the hole with epoxy, then let 7t cure and remove the upper tape, hopefully preserving the threads. If you go that route you might want to consider gluing it in upside down to lock it into the bore.