Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

For a really simple outside idlerpulley, i´d think something like this would work pretty good on this setup.
If the "U-rod" is rotated just beyond 90 degrees (where it tightens the belt the most), the downforce on the tigthened belt should keep it locked securely against the "leaning post" on the drawing? [ Guests cannot view attachments ]