any 505s with transom Strops piccies?

Exactly what are we talking about here? I assumed aft bridle with a centre-lined lower block on the bridle and a final take-off ratchet block half way along the boom? The current wave of popularity of that system is, I think, thanks to the skiffs (even if I set up a friend's Wanderer with such a system 14 years ago - but only because we couldn't be bothered to mount a centre-jammer!)

But if you include a travelling lower block on the aft rope bridle (a la Laser), then you can go right back to the 1960's Minisails or even earlier with Snipes, which also used off-the-boom sheeting. To my knowledge the Snipes started centrelining the bridle block by 1975 at latest, though by that time 'off-the-boom' was being replaced by hull-mounted centre jammers.

For 30 years, I've thought that centre jammers were the dog's b's, now I've gone back to off-the-boom with a ratchet block and can't imagine why I've not always done it! Everything in sailing goes in circles, it seems.

nope, i think they've had prototypes made of masts but there isn't alot of point at the moment.

My boat has transom sheeting, takes a lot of getting used to, biggest issue is the turning block at the back end of the boom.

Gybing is also much more fun with no mainsheet folds to grab