[Tractorfan]

Hi,
I used to clean the carbon studs and the pads of my Sky remote with meths, which worked well for a year or so, So that became part of the annual to-do list.
The Humax Freesat remote started getting 'iffy' a couple of months ago, so I took it to bits to affect a similar cleaning job.
Imagine my surprise when saw that some of the buttons are the usual carbon studs, but the others were metal 'tactile' types pressing onto solder pads. There are tiny points inside the button caps, and after I opened it up, the points must have moved ever so slightly and sorted the problem.
I don't understand why there are two different types of button.
Cheers, Pete.