How to fix contrast
1. Remove the four screws from the P2 top housing plate
2. Separate top housing by tapping sides with soft hammer until free.
3. Turn P2 on and turn the dial until contrast is clear.
4. Clean both mating surfaces and apply thin layer of gasket sealer.
5. Put top housing cover back in place and tighten the four screws. Wipe off any excess gasket sealer.