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Step 1: remove the original ball bearing, grub screw and o-ring and rebuild the regulator section of the HW100
Step 2: from our kit, place the o-ring onto the brass plunger, add a thin smear of the supplied MolyKote 111 to the o-ring.
Step 3: screw the oring & plunger into the Pressure Gauge Test Port and tighten it with a 3mm Allen key (Hex Head).
Removal: To remove, make sure the pressurised air cylinder is NOT fitted and simply insert a 3mm Allen key head into the plunger and unscrew. Sometimes the o-ring may stay in the Pressure Gauge Test Port/Hole when you unscrew the plunger, this is normal, just use a cocktail stick (or similar) to coax the o-ring out.