Teac erase head 2 track 50662090 They have 56 positions but

They have 56 positions but one is filled (or in the plug cut) so you cannot reverse them

Brake solenoid used in the 80-8 and probably in some other models though they seem to change the part numbers each time

for a second I thought it was the unit that the pinch wheel sits on but got my knickers in a twist here an unsure now

This is the cover that goes over the moving metal shaft next to the Pinch wheel

Soundcraft slider knobs

Teac erase head 2 track 50662090 They have 56 positions butI have seen many heads that have same specs but different part numbers and can only assume these are later models though I would have thought they would be interchangable These heads are used but have lots of life left like many the heads are a little tarnished but electrically sound, few passes of tape over them and be fine