Originally Posted by
BIGBLOCK1965
Interesting, it looks like an identical cartridge to the Shopmaster, right down to the mounting holes- it should bolt right in place. My guess is that this is an off the shelf Chinese design from a spindle factory and the Shopmaster factory probably buys them there as well. The only difference I see is that the Skyfire uses unsealed bearings with the seals installed in the cartridge- do they run grease or oil bath? The flanges on the pulleys will prevent the belts from walking off, but unless the alignment is spot-on, you will get wear on the belt edge and that irritating whining sound, especially at 7500 rpm.