Tools for modifying older Märklin locomotive motors to ball bearings

These template tools are made for 4 different Märklin motors. The centre drill bit is supported by 2 oversize bearings with inner diameter equal to the outer diameter of the centre drill.
These tools will help to avoid drilling holes for the bearings exactly at the right spot.

Suitable bearings are:

619/5 2z
D = 13, d = 5, w = 4

Alternative for correcting earlier mistakes wWith space for bushing:
628/6 2z
D = 13, d = 6, w = 5

For the DCM motor you can use:
624/4
D = 13, d = 4, w = 5