73' B3 340 Duster pro touring build

just wondering if a bolt would work better here to tighten your belt. Would it be easier? or did I miss some super trick surprise?

Nope there's no surprise, I am going to make an adjustment tool that will go between the pulleys and will adjust the tension by turning a wrench, sort of like a tie rod center link...easy and simple to use. Something like in the picture.