Inspired from Woodpeckers MT Doweling Jig

https://youtu.be/aTMiGY-m4VU

This is self centered dowel jig, which might be helpful to drill a straight hole to the wood.

This is 2nd version of my doweling jig

This is first version of doweling jig. (https://www.thingiverse.com/thing:2684474)

The inner diameter of bushing is 8mm and outside diameter of busing is 10mm and the length of bushing is between 20mm.

The diameter of bolts that I used is 5mm.

M5 20mm * 3ea M5*40mm * 4ea with washer & nut

I do not make any knob with 3D print but you can adopt the any knob from thingiverse.

https://youtu.be/iJ2ELVdSk8w

I hope this might be helpful to you.

Please stop by my blog for more info.

http://rafaslab.ga

Good luck!!