Well, this past week-end I had my first chance to mount the Delta mortising attachment 17-924 to drill press 18-900L. After cleaning up the oil coating that was shipped, I also had to lightly sand the paint on the inside of the chisel holder in order to fit over the ring on the drill press. It fits nice and snug. As I attempted to secure the steel fence with the bolts supplied, it became obvious that this was not going to work on this model. The square nuts supplied have a double shoulder that is too large to fit the table slot. As well the two bolts are approx. a quarter inch too long. In order to finish my project, I used 2 x 5/16" hex- head bolts. Bear in mind that this is a universal mortiser to fit most of Delta's drill presses so this is a small over sight. The only other point of note is that the chisels out of the box are dull. Really dull. To nobody's surprise. Anyway, a machinist at work can quickly modify the two nuts for me, I'm sure.