Looking good mate. 10mm is as big as you'll need to go but personally id be going 8.5mm.
How thick is your adaptor plate cos it your gonna tap it then you only need about 7mm for an m8 tap.
As above make sure you clamp it to drill it or do it with q bit of wood on the floor while standing on the plate to stop it spinning. Consider starting with a 5mm bit and working up.
How thick is your adaptor plate cos it your gonna tap it then you only need about 7mm for an m8 tap.
As above make sure you clamp it to drill it or do it with q bit of wood on the floor while standing on the plate to stop it spinning. Consider starting with a 5mm bit and working up.