Drive belt (lower belt) for Shopsmith Mark V (1953 to present)
The drive belt is very frequently needed. Replace it when the width of your belt across the top is less than 1/2" so it won't be pinched in the sheaves or make the machine run at incorrect speeds. Replace if the rubber is cracked, or if strands are sticking out.
See the 2 free short videos on my website for drivebelt inspection and how to replace it.