Multi turn linear pots?

I know stepped is the way to go but not having a lot of $$ I do look for bargains. Today I found some 10 turn 1K Beckman Helipots for $5 ea. Big around as a silver dollar and a 2" deep body hermetically sealed. I am not doing anything right now that I need to use a pot in and am wondering if anyone has tried these or something like them. Want to get some more before they are gone if worth fooling with.