Piston Repairs 1
Pistons and Rotors come in for with all sorts of damage, the repair process undertaken is about making ti functional again
Damaged bottom
While the base is removed we use a ball to reshape the damaged port

The outside is polished on a buffer, and ready to be refitted.
Copyright 2017    "Musical Instrument Repairs WA (MIRWA)"             All Rights reserved    E-Mail: service@mirwa.com.au
The bottom is bored out
Also damaged bottom port

A holder is made for the piston on the lathe

Inner port is chemically cleaned
A new cap is fabricated out of brass
Parted and removed
First example:

This piston has a hole punched through the bottom, it appears to be in the shape of a screwdriver slot
Fit and solder the new machined cap
We repair the torn port with a patch internally and soft solder it in place