I have a Delta mortise attachment Kit and the Quill does not seem to fit on my Grizzly Model 1201 Drill Press. T think the Model 1201 means a 3/4 HP motor vs. the Model 1200 with a 1/2 HP motor (not sure?). I looked at the Grizzly Mortise Kit and the Mounting sleeves that go on the quill seem to be the same size. If I drop my current quill sleve (not sure how?) I think it is still too large. Any suggestions?