hello. i have the sony wm-f100 like you and had a difficult time finding a belt. i just found a generic size belt to fit the sony wm-f100 and it is a pn SB08.6 which is a .039 inch and 8.6 inch at www.studiosoundelectronics.com . I tried the 8.0 but too much force exerted on motor spindle. price is 89 cents each. there is a min order. It is a little bigger than origional sony belt but it is working. hope this helps.

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