For my metal control panel, I would like to have some translucent leaf buttons.  However, I have seen that only "short" leaf buttons mount easily to a metal cp.  I would like to use some colors the come only in the long variant.  On Bob Roberts' site, I noticed that he says that one can mount "long" buttons using spacers.  I am just wondering where you could obtain the spacers or if you could make them out of pvc piping or something?