I installed two MACKS rudder stuffing boxes. They are supported in a block of 3/4 inch maple. A Forstner bit provided a nice snug fit. Q-tips are used to keep the stuffing box clean. The stuffing boxes got a good scuffing with 100 grit sandpaper and epoxy was used for all the bonding. They had a rudder that was a close match to the one that Sterling had so I went with those also. I'll match the setup that I have on my PT boats. Dan.