This Penny & Giles 1520 fader is a very high quality audio fader used in many mixing desks such as Neve, Cadac etc, but can be used in your own design mixing desks.
It has been tested for all functions. it has backstop muting and prefade back-press available via internal micro switches. 
Just about every part is serviceable and interchangeable. The front face plate can be changed easily to allow for owner designed faceplates, as well as the sub panel below. In the unlikely event of noise the actual conductive plastic track can be easily cleaned with purified water.
It is supplied with an excellent reliable Plessey 16way connector for plug in instant replacement.

A full dimension diagram with connector details is supplied with each fader.

Width 45mm,  length 173.5mm, depth with connector approx 79.5mm.

I have many more of these faders as well as different widths of 19.5mm and 31.5mm front panels. Please contact me through eBay if required.