I have a Delta mortising attachment Model 17-924, and a Craftsman 12 inch drill press model 152.219110. The largest split ring bushing in the Delta won’t fit the 5.2 mm quill of the Craftsman. Does anyone supply such a split ring bushing for the Craftsman? Or is there some incompatibility between them that precludes this? Delta says they don’t make one, and Sears says to contact my local Sears store, who don’t know what I’m talking about.