I originally bought this Sky-Watcher 6x30 for my 127mm Sky-Watcher SkyMax (Maksutov). Unfortunately the spring plunger thingy is borked and the finder would too easily rotate in the bracket. This would ruin the alignment making it basically useless. After a while I ended up using the straight through finder that was actually supplied with the 127mm Mak. It's easier to use for targets predominantly in the plane of the ecliptic anyway. The borked finder's diagonal looks identical to my Synta Amicis, and the nosepiece and original drawtube from the Amici prism diagonal also supplied with the 127mm Mak fits the finder's diagonal perfectly. The Amici diagonal supplied with the Mak is now wearing the drawtube and helical from a borked William Optics Amici. I've compared the new Amici diagonal created from taking the prism/housing from the borked RACI, and adding the drawtube and nosepiece from the original 127mm Mak's diagonal, with my other resin bodied Amici diagonals and I can't tell any difference. So, to all intents and purposes I have a new salvaged Amici diagonal.