I recently bought a drill chuck with a #2 MT base. My problem is that it won't stay seated. If I don't have the tailstock applying presure it works itself out. I've not had a similar problem with any of the drive centers that I use. The "shaft" is much longer than those on drive centers. I thought maybe it had some grease so I cleaned it with solvent but it didn't change anything. Did I just get a defective one?