OT: mounting homebrew contact mic

[CCartCat at aol.com]

Thanks to Harry Bissell & his idea (gluing a .177 wadcutter pellet to a 
RadShack piezo--#273-064, $1.79), I now have a piezo contact mic.  But I 
don't plan to attach this unit to a big metal/nylon disk for use as a drum 
trigger. I wish to use some kind of non-destructive removeable reusable 
adhesive to place the face of the piezo/pellet gadget securely in contact 
with, say, the soundboard of guitar or for other such temporary 
installations.  Any suggestions/sources for such an adhesive or other means 
of temp. attachment?

Thanks for your help,
Kevin