Last time i built the engine up i used one of those pesky band type piston ring clamps and it wasn’t the greatest thing for fitting them. So this time i did a bit of reading and came across these ring compressor sleeves from Wiseco. They start off wider and taper to the same size as the piston bore. So i bought one to try it out and they are Amazing. No hitting the piston top with a hammer end or something like this. These you can just push in with your fingers as unlike the band type that you have to clamp nice and tight and then force the piston out, these just squeeze the rings in as the piston slides down the sleeve and they just go seamlessly into the bores 🙂