I would NOT use a 12mm pin - that is far to undersize.
Depending where the pin goes (is this the one that holds the stainless steel
arms onto the turnburckle and deack fitting) you can use a 1/2" bolt with washers to get the proper spacer alignment.
I did this on my boat and after 4 years of use I changed out the old bolt for a new bolt. The old bolt only had a small amount of wear on it.
I have a NC42 system which has heavier loads on it than your 32.
A word to the wise - NEVER use WD-40 or any of the liquid lubricates on the upper and lower bearings - you will wash the grease out. Just carefully inject grease into the bearings and wipe off the excess.
Profurl told me this after I had destroyed the bearing and only charged me $500 to replace it.......
Other than that, a great system.