^The washer may help, but it is still a single point of connection. My Rainman kit fell apart on two separate occasions while playing... I mean pump handle, pump mount, and body were on the ground in pieces. I went back to the stock kit. Your mileage may, and apparently will, vary, but that style of UC kit will never again appear on any Phantom I own.
The Phantom is a beautifully simple and reliable design. Anything that compromises this, even a little, is not worth it to me.