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4. Using the Oring spanner wrench, remove the brass retaining nut from the amplifier head by turning wrench CCW.
5. Remove Delrin thrust washer. It may be useful to use a piece of tape to help in pulling the washer away from the head.
6. Remove the Oring using a sharp tool that can pierce the Oring so that the Oring can be pulled off of the rod and way from the head.
7. Install new Oring. The use of a small blunt-ended tool such as the end of a 5/64 ball driver will be necessary in order to press the Oring over and around the rod and between the rod and the stainless collar holding the rod. Try to press the oring so that it is seated as uniformly as possible, but using care to not press to hard, which could result in a puncture or cut into the new Oring.
8. Clean the end of the rod surface as best as possible. Since the diameter is 2", multiple swipes with a clean sheet of lens tissue before each swipe will be necessary. Take the time and patience required to do a thorough job. Acetone is best as an initial cleaning solvent to remove the bulk dirt and grime that may have accumulated followed by multiple swipes using methanol.
9. Clean the new replacement Delrin thrust washer and insert it into the amplifier head and carefully push it up against the Oring. Install the brass retaining nut and tighten snuggly using the spanner wrench to compress the Oring. Use care not to over tighten.
