Fastening cleat to mast

[crewman]

I want to fit a cam cleat to my mast for the spinnaker halliard. Yacht is a Sonata. The intention is to speed the hoists and drops when racing. Obviously the cleat will take a fair load, and there is no access to the inside of the mast. Can you buy support plates which can be rivetted to the mast? If so what are they called?

 

[VicS]

Something like this http://www.sailboats.co.uk/Catalogu...ce_Adaptor_Large_Black~p_RO-RF5416~c4797.html

Or maybe a Clamcleat that would fit vertically onthe mast rather than horizontally http://www.clamcleat.com/

http://www.clamcleat.com/applications/application_details.asp?theid=29

 

[William_H]

The idea as I am sure you have in mind is to hoist the spin at the mast cleat it then transfer the halyard control to the cockpit for release.
This is a great idea for racing but requires that the halyard exit the mast quite high up so that forward hand can use all his weight to pull the halyard down.
If you want to be able to transfer control of the halyard to cockpit then you need to be able to release the control of the halyard at the mast while it is still under load. The only way to do that easily is with a clutch ie cleat with opening lever. (yes they are expensive).
If you don't have or want a halyard exit up high then best have halyard go back to cockpit.
If you don't want to be able transfer control to cockpit then use a horn cleat. Much more positive and reliable. A horn cleat also is narrow enough with holes one above the other that the curve of the mast does not matter.
Either way consider tapping a thread for ss screw with duralac. Easier than rivetting and lots of length.
good luck olewill

 

[charles_reed]

The idea as I am sure you have in mind is to hoist the spin at the mast cleat it then transfer the halyard control to the cockpit for release.
This is a great idea for racing but requires that the halyard exit the mast quite high up so that forward hand can use all his weight to pull the halyard down.
If you want to be able to transfer control of the halyard to cockpit then you need to be able to release the control of the halyard at the mast while it is still under load. The only way to do that easily is with a clutch ie cleat with opening lever. (yes they are expensive).
If you don't have or want a halyard exit up high then best have halyard go back to cockpit.
If you don't want to be able transfer control to cockpit then use a horn cleat. Much more positive and reliable. A horn cleat also is narrow enough with holes one above the other that the curve of the mast does not matter.
Either way consider tapping a thread for ss screw with duralac. Easier than rivetting and lots of length.
good luck olewill

A caveat to the above - pop-rivetting is far more successful than self-tapping - if you do go down the latter course bond a single wall section of mast section (easy if you're a rigger) using 2-part epoxy before drilling and tapping.
I'd also support the recommendation to use a horn cleat in preference to an auto-jammer but single-handed on a larger boat I use only the halyard clutch at the cockpit.