I got both a slider and a mini t and noticed the mini t has 4 wires on the servo and my slider has the normal 3. Was thinking of using the mini t for spare parts but was wondering if a wire could be removed from the 4 wire servo and be used as a spare. I imagine it has 4 because the mini t had the reciever speedo combined?????

unless you put it all in the slider, you cannot use the servo.

I got some mini servos for sale brand new, if you need one.