A Long Drill Bit
I have not been looking forward to attaching the Trevithick Dredger Engine to its base.
I needed to drill through the steel plinth and the wooden plinth, and then through the top part of the base. Trouble was that the boiler and engine were in the way.
And it was not feasible to tip the whole assembly upside down and drill from underneath.
Ahah! what about a long drill? I measured it. The drill would need to be 450mm long! Even a long drill bit, ferociously expensive, comes at a maximum length of 150mm.
So, I made a long drill bit, 5mm diameter, 600mm long