Pitch Wheels

[musicinablender]

I am building a DIY controller and am thinking of including a pitch wheel, like those on synths and keyboard controllers. I know that these are spring-loaded potentiometers of some kind, but I don't know the technical name of them. I googled around and haven't been able to figure it out. I'd love to be able to just order one somewhere, or am I gonna have to buy a cheap old synth or controller simply for the part. Thanks.

[Maxted]

Found some: http://www.doepfer.de/home_e.htm

Products, Scroll down to accessories and spare parts, Scroll down about 2/3 of the page to keyboard accessories and they have a few different ones.

Couldn't find a price, website is a bit of a pain.