The throttle pedal is much stronger than it needs to be. You only have to move the cable against its own liner friction and the butterfly against its own return spring. The pedal should always run out of travel first. I’d add an adjustable pedal full throttle stop where the pedal strikes the head of a 5/16 bolt with a jamb nut to hold the setting. This should help prevent a cable failure.
For return springs, consider cutting the center of the pedal tubes out to insert 180 or 120 torsion springs:
https://www.mcmaster.com/springsThere is only the outer race built into the pedal and the bolt. You can grease the bolt for reduced wear but add some bits of metal around the bolt head to keep it from rotating back and forth with the pedal, sawing through the adjustable flanges. Double nut since you can’t torque it down since there is no positive stop/inner race tube to tighten against. Take a look at my tracker shifter. It uses what I described except I also have a nylon bushing.
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
viewtopic.php?f=5&t=13225&p=134742Simple Spring select
viewtopic.php?f=5&t=11815LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12