This is a phenomenally useful comparison, griff!
Question for you – have you seen any clip length or shape differences?
In my trawling around for a good 2nd release non-lead window version, I saw what looked like a different shaped clip mount (more squared off) on one with a lead window. Also, in another comparison, it looked to me like there’s a length difference too:
Sorry, I should also point out what versions correspond here. I took a photo that @Pdunc67 had used in his Accugraph review video and removed annotations for a simpler viewing:
