360 degree servos and low friction potentiometers

[Sling]

Hi I need to find a low friction degree potted potentiometer - standard specs for use as a microcontroller input, something like 50k ohms or whatever. The main thing is that it is low friction.

Also I'd like to find servos that can rotate 360 degrees or near that. Ideally something with similar dimensions to the Futaba s148 but with full rotation without the need for external gears.

I realise that this is probably more electronic than electrical but worth a try...