(Updated Sept 29th 2023 with pics at bottom of fitted tiller arm, fitted May 14th 2023)

If my Hydrovane is a 1st mate, then the Autohelm is 2nd Mate – or at least a talented Cabin Boy!
I have no idea if my old version can be upgraded to work with the as-yet-uninstalled new Raymarine radar system. I’m assuming not.

Back in November 2015 the control head was deluged by a freak wave halfway across the Bay of Biscay (I know..what else happens on a sailboat? But there we have it!) and burned out, leaving me to handhold Frank to Camariñas in a (what else in November?) storm. Parking up in the aforesaid fishing port for Christmas, I returned to Texas and found a new unit on ebay.

But at the other end of the Autopilot, attached to the Type 1 hydraulic ram, is an arm. This connects the ram to the tiller shaft. It was still working, but badly corroded. Here is is after I managed to get it off:

And here is the new one!

The hole for the tiller shaft has been machined to 1.25″, but the key is not uniform to 3 decimal places (it has had a hard life..) so I took the arm without a keyway cut. I’ll have to find a shop to get it machined.

This tiller arm is bronze and weighs maybe 10-15 pounds. Slow progre$$, but progre$$.

I was convinced that installing the new tiller arm was going to be a brutal job, and that I’d probably have to buy a different one. So I kept finding easier jobs to do. Back in May, I stiffened my sinews, plucked up courage and squeezed myself into the transom.
Fitting it took me all… all of 30 minutes. Gobsmacked.