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My father's '54 M-37 has the incorrect throttle return spring and we would like to change it back to the factory design. He ordered the correct spring, but it is unclear from the exploded diagram where the spring extension attaches to. I assume it is somewhere on the firewall. Someone hacked a hole for what I assume is a non-standard heater core and I'm not sure what other changes have been made over the years. Can anyone advise where the spring attaches to opposite from the carb linkage (the hook at the end of part X)? Should there be a floor plate bolt with a lateral hole in it?

Mine is hooked through the cotter pin eye on the castle nut on the right rear engine to frame mount. I don't know if it's "correct" but the alignment and distance are perfect. I can't find any pics of that end of the spring.

Disregard, I see you got a reply and pics from steel soldiers. Looking closer, I see the flange hole on my cab. Guess I'll hook it in there.