You will first need to remove the
current Compression Gland System from the chamber lid. This can
be done by simply unscrewing the Compression Gland Screw and then
removing the 4 brass screws underneath the lid.

Assemble all the above parts.
From left to right - (Chamber Lid, 4 brass screws, 4 O-rings (size
006), Grass Compression Gland, Grass Gasket, Grass Compression Gland
Insert, Friction Washer and Compression Gland Screw.

Ensure the lid is free of dirt and debris.

Lubricate O-Rings with petroleum jelly (lightly) then install into
screw holes.

Slide Grass Compression Gland into place - align with screw holes.

Turn lid over and prepare gasket - ensure it is clean.

Place gasket into gland. Align the slit in the gasket and gland.

Install Grass Compression Gland Insert - flat side up.

Place Friction Washer on top of Insert.

Screw the Compression Gland Screw into the Gland.
The final product should look like the above.