Tascam 32 34 38 22-2 22-4 X-7 X-300 and many others guide roller cap

Standard cap widely used on machines there is only 1 of these on a machine do not confuse this cap with the tension arm ones this is about 23mm wide, measuring the thread like top of tooth to top of tooth is 2.96mm so guess M3.

I have some guide roller caps scratched perfectly functional half price, just ask