I have a DeWalt DW421 Sander. Don't know if Type 1 or Type 2. Suspect an older Type1. Purchased at Orchard Supply Hardware in Sunnyvale, CA quite a few years ago. I have replaced the sander pad and would like to replace the three screws that hold the sander pad in place. However the three screws currently in place are finely threaded screws and there are none like them listed on the ereplacementparts.com web site under this model # for either type1 or type 2. Any idea where I might be able to find replacements? Thanks.