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This guide assumes the reader has working knowledge of the HW100 e.g. how to remove the stock from the action etc..
To use this guide, the original Grub Screw, Ball Bearing and O-Ring should be removed from the Regulator Pressure Gauge Test Port. Sometimes the ball bearing will drop out of the hole BUT that does not happen very often. If the ball bearing does not drop out, then you will need to dismantle the regulator and pop it out with a small Allen key - the HW100Tuning Pressure Gauge Test Port Upgrade was designed by us to negate ever having to do this again. If you need any help getting the ball bearing out, try this guide: HW100 Regulator Tweaks
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.