Hypercube XY-Joiner double 10mm bushings

This is my first design of the modified XY-Joiner by sprucegoose. He took the original part from tech2c and designed it to fit two bearings instead of just one. Since I want to use 10mm aluminium rods with 10mm brass bushings on the Y Axis I adapted this part to fit two 10mm brass bushings inside the adapter. This ensures that the two bushings are aligned. I changed the collar of the original lm8uu mount so that these can now fit 10mm tubes. I also changed the diameter from the X Axis Rods back