The way I do it is to pre-drill with the smaller drill bits, starting with the 1mm for a precise location for the centre of the hole. After that, simply step up with the drill bit sizes (to a 2mm and 3mm using the hand drill) and enlarge the hole by using the initial smaller hole as the pilot guide. By the time you get to the 3mm hole size, any large size requirement can be easily accomplished with the standard drill bits without the need for a holder. Having said that, I do apply a few masking tape layers on the holding shank of the larger drilling bits for a better finger grip.
PS: This method is a standard way for drilling large holes on wood and metal to avoid over stressing the drill bits and the drilled component (especially so with bits on metals, and prevent softer components, i.e. plastics & resins, from uncontrolled tearing!).
PS: This method is a standard way for drilling large holes on wood and metal to avoid over stressing the drill bits and the drilled component (especially so with bits on metals, and prevent softer components, i.e. plastics & resins, from uncontrolled tearing!).
