Doesn’t this method potentially introduce lube on the high pressure side of the piston o-ring? He fills the ambient pressure side of the housing with grease then pushes the piston/bullet through it, doesn’t this push some grease into the HP chamber? Would this be a concern? Maybe if the bullet slides through without touching the sides and drops out this is not an issue?@superstar made a "how to" vid of packing a MK10. It's pretty much the same way I do it, except I have less waste. The surplus grease goes into a zip lock bag for later use. Then I fill the boot up before installing.