The first step is to remove the original parts from the right side to get access to the housing.
The next step was to use the 4 existing holes on the right side to drill through to the left side. Here it is setup on my drill press table over the slot in the clamp block below. Two holes are are for the shoulder bolts, one for the roll pin and the last is for the torsion spring.
I then flipped it over to the left side and finished drilling the holes to final size.
I then tapped the two #10 holes and did the countersinking to .125" with a 1/2" cutter.
This makes room for the torsion spring. The original torsion spring is a right hand wound spring and is the only part that cannot be reused. I ordered in left hand wound torsion springs from McMaster Carr part number 9271K142 (https://www.mcmaster.com/#9271K142). With some trimming and bending of these springs I was able to make a torsion spring for use on the left hand side.
Here is the setup on the left hand side of the crank prior to installing the spools and crank handle.
Here is the finished C2 setup for use with the left hand.
So with a bit of machining and one new spring the C2 can be converted for left hand use and can be swapped back to right hand use.
