Drill guide of metal 5,6,8 and 10mm, the board thickness can be adjusted by 2 pins, the initial hole in the board is held by 3 fixations, no wobbling, the 3rd fixation is replaced Duch dowel template for the 2nd hole, which applies to the narrow side of the board, here the exchangeable soil used without foam, for the surface hole, the bottom of the dowel Kings is exchanged with foam floor, here there is only logically 2 fixations for drilling, I think it is the simplest device for dowel holes have me quite a few videos from other manufacturers looked.
