Inside that back thing is the threaded widget that ought to be stainless steel but, in my boat, is mild steel.
It's a problem which affects quite a few others too if the thread on the UK Forum is anything to go by.
The replacement arrived within twenty four hours, which I reckon is good service on Valley's behalf. OK, it was a mistake, but mistakes happen, and I judge companies on how they subsequently put things right.
It will take me longer to install it. I possess more thumbs than fingers when it comes to this sort of thing.
And with a decent forecast this coming weekend, I'll be paddling my boat not fixing it. The Crowlin Islands and Applecross look likely.