This is the cap that's used on the Tascam tension arms, this now is a very very rare part and everyone is after them as they always get lost
These are rare now and TASCAM no longer offer them as a spare.
Many times people buy the wrong part then return it to me, this is the part you need on the moving tension arms on the far left and right of the machine.
PLEASE BE CAREFUL WITH THIS
The caps have a different internal depth but they do not fit some machines please look at extra photos
Where there are two photos the one on the left with the shorter depth is what you need, for the above it can have the same front or maybe straight.
Sometimes they can be more shiny not finished i have some variations
One lad was looking for a cap on his 32 he sent me a photo of the roller which had a very similar top to the 38 (the deeper one) it maybe that you need a different roller and top then for the 32 TBA
you cannot use the smaller roller top as it appears the tension arm is same as the the 38
I have some scratched ones , mechanically fine and 10 pounds cheaper please ask if your on a budget