Widely used in the later Tascam models really rare now
Be careful here as it seems at some time they used two caps on these machines
This cap slightly overlaps which is not a headache if you use the reduced height pinch wheels if you try to use the standard ones they will rub and jam at the top, the 38 seemed to stick out a bit further and with extra washers was not an issue.
In some cases over time people have used a different cap in the service centre etc so now they are pretty mixed out there, the standard 1/4 inch tyre willl only work with the older flat caps
I have one with a deep scratch across the front, mechanically perfect, if you want that its half price just drop me a line
I have seen there are two models on the 38