Well it seems that I have to replace the engine control lever on Seaka.

I have down loaded the Teleflex Morse and the Sea Star Solutions catalogues and can see the single lever sail engine controls suitable for my yacht.

At this stage the only source of these controls that I have found is at Whitworths [page 81 Cat no.34488] and the one pictured is from Sea Star Solutions but does feature in their catalogue. ???

Has anybody had experience with the WW item or is there a better one out there? The WW price seems to be OK.