MD 180 Broken Mast

[IN2DEEP]

Originally Posted by Mahigeer

Are the shafts stainless steel?

If so drilling SS is very difficult.

Unless they are less grade of SS.

Regardless, good job on repairs.

Def not a lesser grade stainless
The mast are made with Ph 17-4 SS which is heat treatable and is magnetic
The mast are much stiffer than 303, 304 or 316 SS of the same size.
As others have already said. Slow RPM with lots of pressure and cutting oil