I have always just used brute force, pried down on the gear case till the roll pin breaks.Then look AND FIND the remains of the pin. I have always tried to remove by rotating the flywheel first though,only worked once for me.
A local Seattle outboard repair shop counter guy told me the pry till it breaks technique,and gave me a lot of other helpful advise on my 6 hp when i first got my salt water PSB boat on 1993,and was new to outboards. He was a big help .
Jim PSB
"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson