I have a GE LC-628 I've been restoring. I saw one for sale recently on ebay but it had a different tonearm on it. The one that's in mine now tends to fall off the stand really easy and gets caught on the lid. Can anyone tell me which one is the right one? The top one is mine and the bottom is from the auction. Also, is there supposed to be a rubber grommet or something attached to the top of the armrest? Thanks!