My Delta grinder started making a bearing noise, coincidentally? immediately after I accidentally ground into and shorted out a lamp cord (!) that was hanging behind the grinder. Grinder continues to work fine, but now has a sort of scratchy, dry bearing sound. I just took it apart and the bearing is labeled 6203 RZ. I’m having a hard time finding that bearing, but do see 6203 RS available, including option made by Timken. I know that the letter designation refers to the material that the seal is made from. Any reason not to use RS? Thanks for advice!