Cutting oil is almost always pointless unless you're in a machine shop
I would always use a water soluble cutting oil/ coolant even on site as it extends the life of the broaching cutter or drill bit.
Most mag machines have a facility for applying the coolant direct to the centre of the broaching cutter.
Though I would just use a small hand held pressure pot sprayer.
The best mag drills have an auto feed / retract and power off function.
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