Tim, thanks for the link!
3 rings. Hmm. But (counting from the bottom) the spacing between ring 1 and 2 is slightly wider than stock, spacing the rings farther apart. And the seats of the ring lands do look slightly higher (to push the rings out more), but hard to tell without a micrometer. Also cannot tell piston diameter without micrometer. I know the expansion coefficient of brass is a lot more than aluminum or steel, which is what I normally work with, so tolerance will have to be greater... but given the reported sloppy tolerances in the bosco piston to cylinder groups I've read about, its a given that a custom made one can be made to match the existing cylinder much better, especially since I'd be able to get the cylinder dimensions before I start. I have no idea what is happening near the mounting flange on Paul's design. Is it 2 piece?
But, interestingly, its day 2 with the new cafelat seals, and it's grabbing slightly lower! just a tad, but definitely lower. Now consistently about 10:30, near 45 degrees... I never saw anyone post the 'best' case scenario with the best seals.... no one wanted to come forward with that?