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Valve assembly

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I dont fully understand the valve assembly process. It says to glue a 3mm jam nut into the spring retainer. Does the end of the 35mm rod need to be threaded?

Use a 45 mm long socket head bolt cut down to 42 mm for the valve stems with the head in the valve and the threaded end in the spring retainer.

Ah, I hadn't thought of that. Two questions if I may. The instructions show 35mm length. And do I cut the head off of the bolt? I dont think the head will fit into the top of the valve.

The head of the bolt fits into the valve. If it doesn't you may have a burr or lump of plastic in the hole.