I have some Gerdes master cylinders that were given to me years ago
which I am just now planning on using. Don't know much about them,
but was wondering if it wouldn't be prudent to have them be rebuilt
( overhauled ) before I use them, since they've been on the shelf for
so long. Is it actually possible to have them be overhauled and would
it be cost effective to do so? Thanks

Neal