If you do then it's totally worth it. The Harbor Freight grinder motor is on the weak side, but this works. I have a 2x48 Dayton so don't need the conversion. I did a review of the Dayton here and suggest you look it up if you're thinking of buying the 4x36 and the Jiffy, the Dayton's 3/4 HP motor is really 3/4 HP and is direct drive to the drive wheel, no pulleys. Also has a totally enclosed fan cooled (TEFC) motor. It all comes down to your budget, but the Dayton is built like a tank, but does need some modifications for knife grinding. It is all in my review, pros and cons.
Here is the Dayton, sadly when I bought mine it was on sale at $228, but has gone back to its regular price of $356, free shipping, which is important as it weighs 67 lbs.
https://www.zoro.com/dayton-belt-gri...n7/i/G2178741/
Here is a YT review of the Jiffy.
https://www.youtube.com/watch?v=6ir8qSV5gOg