Send to Dumore to get some proper belts if you want smooth grinding results. Those belts are wrong. High speed tool post grinders use cloth thin belts with NO CLEATS. They aren't much thicker than 2 layers of scotch tape so that they do not affect the spindle with vibration. And,run the grinder 1/2 hour before using it. This gets the bearings up to the right diameter(which is a very small difference,but it affects your ground surface quality).
To get the best results,run the lathe BACKWARDS at high speed. It might seem that running the lathe slow would be better,but fast makes smoother grinds,believe it or not. And,correct belts are very important,too.
Also,find out from Dumore what lubricant EXACTLY to put into those oil cups. Don't get sloppy and use just anything. ESPECIALLY,do NOT use DETERGENT motor oil. New high precision bearings will cost big money,so be careful what oil you use.