Tascam 48-OB Capstan motor BM-5B3 volt 25 watt

This motor has come out of one of  A TASCAM 48-OB

But here is the mystery, I think this is from a low speed machine , I have had a BM-5 motor before and that 100% had a much bigger shaft.

I always understood that these machines could have speed changes , and I thought that was just the belt/pulley and some links changed, but here its also the size of the shaft.

Would love to know for certain.

As to if , this can be modified, I do not know, though if you have  duff motor, with the correct shaft maybe.