I've been on a boat with what seems to be the same item portrayed earlier on this thread.  It is not actually a clutch but a brake released by squeezing the handle.

A real clutch is called a Tiller Tamer.  A knob on the bottom is used to adjust tension on the holding line making it much more useful.  That's what I have.

Regards,

Rick Lange

On Thu, Aug 5, 2021 at 9:48 AM Graham Parker <gramille at tds.net> wrote:

> I am tempted to put the tiller clutch on my boat but I am not sure about
> the wisdom of screwing into my fiberglass tiller. Has anyone else done this?
> Graham
> sv 00Sailin