I have a Gen I FX Crown and I've started getting pretty bad regulator creep. Would you repair and reseal the old regulator or just replace it completely with a new Huma?
If it has the plastic (black Delrin) piston, my recommendation is to replace it with a Huma because it will be more precise and durable over the long haul.
If you are a DIY kind of person and don't want to spend the money, dress the end flat and smooth and keep on trucking.