Bobbins were nearly sheared when purchased and I did same as you but using cable grommets from heavy electrical connectors and some penny washers. Bobbins were replaced under warranty but of course failed again. My repair was better than the factory fit in compression but did not give any shear protection. Thinking of polyurethane bobbins from eBay. I do wonder if the new Brooklands style pipes have a fix built in?
I love the 3W. it not just a mode of transport its a social phenomenon More so than perhaps even Morgan realise. However as an engineer I have been suprised by some elements of build quality. Looking forward to fettling these snags away.
