Drive belt (lower belt) for Shopsmith Mark V (1953 to present)
The drive belt is very frequently needed. It is a unique size, not available in a generic size. 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.
This belt is superior to the ones typically sold by Shopsmith. Wider and thicker for better traction and longer life.
See the 3 free short videos on my website for drivebelt inspection, superiority of this particular belt and for how to replace it.