I might contact leatherman and see if they coould replace the broken Flathead and plus its a little loose these days, comes with age i guess
the loose part 
paul
Paul I take it your talking about the flat head on your wave ? Ok listen carefully I will only say this once

Whitby and co are the importers and distributors of Leatherman in the Uk and they take care of UK warranty . You can send it all the way to the states if you want but Whitby are the official UK LM Warranty guys . Phone them up on 01539 721032 and ask to speak to someone in the Leatherman warranty department . Explain to them you have an original ( old style ) Wave with a broken flat end screwdriver ( tell them exactly which one it is ) and ask if they have any in stock as you don't want the tool replaced with a new style as yours has sentimental value . They will soon let you know if they have one in stock .
Then send your wave recorded and with a letter explaining whats wrong and repeat the bit about wanting your tool back for sentimental reasons to
Leatherman Warranty (UK)
Whitby & Co
Aynam Mills
Canal Head North
Kendal
Cumbria
LA9 7BY
You should have it back in about 7 days .
This is exactly what I done with my SideClip and I got fantastic service .
Dunc