Ms. B.
Sometimes the manufacturers of great products make small errors in their choice of belt suppliers. Case in point, your Ryobi Sander comes with an OEM belt made overseas, and very cheaply. I personally recommend buying a Bando/Gates 150XL037 timing belt for your BD4600 sander. Also called a “timing belt” or “synchronous belt”, Bando and Gates both offer very high quality, made in USA, competitively priced replacement belts. If you can’t find one at your local hardware store, try to shop online for timing belts. The best price I’ve seen is at BeltPalace.com for under $4.00 plus shipping. As usual, I recommend ordering a spare to keep on hand just in case your husband gets carried away with his projects.

Thanks for your contribution!