Woodworking centre finder

Just a simple jig to help drill an 8mm hole in the centre of a length of wood, use a skateboard bearing to insert into the centre hole so an 8mm drill will fit through it and allow you to drill one hole in the middle of the wood or several to define a slot for a mortice and tenon joint, you can enlarge the 8mm holes with a bigger drill if required.

I used an 8mm flanged ball bearing race from Aliexpress or Banggood