Consider the size of the pin/nut to be welded and a few other things:
This is not on a bench or easily accessable.
This is on a vertical plane, very restricted area with the bumper etc. right behind.
How would one hold the nut precisely over the pin, get the stinger in there, get the crank grounded, get the head in there so one can see???
Please, this is taking on a utopian character.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.

Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".