I forgot about the mandrel.... I never used one, I didn't know it was needed. Just press the bushing in from the top with a flat washer and it will end up in the correct place. You need to be careful choosing the socket to hold the bottom of the 'adapter cpl' body as the bushing sticks a mm or so out from it. The reservior body doesn't need to be unscrewed- the piston can be forced out with compressed air. However, when I first tried to unscrew the cap I held the shock body instead of the reservoir body and the whole reservoir unscrewed so I had to make the tool to get the cap off. If you do this, be very careful not to damage yourself or the piston. I have modified my reservoir pistons so that they can be grabbed from the bottom. This is really helpful in dissasembling the shock and setting the piston height when putting it back together. http://www.advrider.com/forums/showpost.php?p=6136196&postcount=27 Shock disassembly. http://www.advrider.com/forums/showpost.php?p=6137864&postcount=29 Reservoir piston mod. Here's how I vacuum bleed the shock. http://www.advrider.com/forums/showpost.php?p=6158218&postcount=34 Set up the pump like that, suck the air out and when the bubbles stop then release the vacuum so that fluid gets sucked back in to the shock. Repeat until no bubble come out. Using thicker hose from the shock to the fluid jar makes things much faster.