Scatman,
Why not use a 1/4"-20 x 1/2" SS button-head cap screw? Drill a hole (no tapping) in the Reservoir Cover and install the screw from the underside of the Cover. Use a dab of BLUE Loktite on the threads to prevent the screw from loosening.
Clean, simple installation and the button-head is about as thick as a "jam" nut.
If you don't recognize a button-head screw, Google it...!
Why not use a 1/4"-20 x 1/2" SS button-head cap screw? Drill a hole (no tapping) in the Reservoir Cover and install the screw from the underside of the Cover. Use a dab of BLUE Loktite on the threads to prevent the screw from loosening.
Clean, simple installation and the button-head is about as thick as a "jam" nut.
If you don't recognize a button-head screw, Google it...!