monoprice dual extruder / flashforge creator pro z-wobble fix

After a year, my printer started to develop z-wobble. The two rods are pressed in pretty tight in the top, the bottom barely grabs them at the bottom (and there's a huge gap that is 35mm tall). By printing a pair of these spacers, it really locks in the rods tight on the bottom.

Ignore the bearings in my photo. I happened to have some 10mm x 26mm x 8mm bearings lying around so I opted to make my bosses a little shorter and use bearings as a solid support.

As far as getting the z-axis ou