Your rod traveller has been added...
There were two arrangements on the O22: One version has a triangular stanless plate, with three holes, with a two part backstay attached to the upper and lower holes. The third hole in the plate was used to attach your mainsheet block. I've heard it described at a "poor man's backstay tension adjuster"... for as the wind picks up, the backstay would become tighter. This arrangement was most likely used simply to free up cockpit space, however.The other arrangement, which I have on my '73 O22, does not involve the backstay (which is one-piece, as is normal). Instead, there is a single sheave stand-up block on the starboard side aft, and a single-sheeve stand-up block with jam-cleat on the port side aft. The mainsheet is first attached to a tie-off on this port block, then runs from there, through the double-block on the boom, then through the starboard single block, then back through the other sheeve on the boom block, then through the sheeve of the port stand-up block and it's jam-cleat, and into my hand. It needs to be almost 40 feet long to be able to let out sail! This arrangement makes crew seating in the aft of the cockpit a bit close, but it's not too bad. I would not change it.Your rod traveller has probably been added by someone. If it was a track, it would not work under the tiller, of course. So they went for a rod. But unlike track, I really don't think there is an "aftermarket" gizmo "stop" of some kind to limit the travel of the bblock. The real issue is: can you take in your sail sufficiently to sail close hauled? If you cannot bring the sail in enough for effiecient pointing, then I would change back to one of the original arraingemnts. Rich SC.