The only Ruddertwin I have right now is a C.
Took a while to dig it out. Trying to get you the
center to center distance. The line at 2″ on the
ruler is deceiving. Looking at the spacing of
the outer lines on the paper seem to indicate the
center to center distance is closer to 1 – 15/16″.
You can get the hole dia. from your flywheel
and timer. The red line indicates where a hole
need to be drilled. Oil that exits the upper
crankshaft bearing travels through this hole
to lubricate the timer.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.