What part of the Blast is loose mate
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Leatherman uses Loctite on it's fasteners , it would be a good idea to use some thread locker on your Blast's fasteners threads,when you do tighten it up, to stop them becoming loose again. You can use a variety of tools too adjust Leatherman's knurled fasteners BUT it is easy to bugger them up if you are not careful. Pliers , vise grips,all work, some people use a Letherman Crunch. You will need x2 tools to grip both ends of the fastener at the same time.If the fastener is not loose & you want to adjust it , it is a good idea to apply some heat directly too the fastener first too 'crack' the Loctite seal on the threads.
I had wondered if the Blast's days were numbered when LM retired the Kick & Fuse
has not happened yet though.