Originally posted by John Larkin
Drill one 1/8" hole in the lower "light" weight that the spring is behind. Just pick an area off to the side. FWIW, I have about 7 holes drilled in mine and it's strong, but I installed a set screw to hold the spring and had to offset the weight of the set screw; you won't need that many holes. Deburr it well and reinstall. Should get you to 5000. It's a PIA to get this set right, but once you do, it's nice to be done with. Also, might as well install a drainplug since you are likely to have to drill another hole or worst case, service the filter in the spring. Good luck!