This Is a work in progress. I was ask to make an adapter that works with the existing mount that would allow a person to mount sharpies and other not spindle items. this adapter should slide right into parts B10, B11, F2, and F3. I have tried to include a diagram to display how it should work. It may be necessary to wrap a little tape around your sharpie if you are using one thinner than i based the model off of. You will need to print this part four times. I was thinking that this might also work with an xacto knife if you mounted it in a thrust bearing. we will see.Print part 4 times and assemble as demonstrated in crude included sketch. LOL