Please note the tape tension arms are normally the ones that move up and down as the tape moves along. often they have mounted on the pin a roller and a cap to stop the roller coming off, at both sides of the roller is normally a black or clear teflon washer.
Tape guides are normally fixed and dont move, they wear after a lot of use and should be turned, these are sometimes called pegs as well but if the tape runs through them then they are a guide, pegs normally hold the tension arms in place
The tension arms are normally fixed in the centre and also can be fixed or move a little to get accurate feed of the tape across the heads they also have a teflon washer normally a bit larger on both sides of the arm.
Tape lifters are two (or more ) metal shafts that lift the tape away from the heads to save wear they also need turning from time to time