You are probably lucky enough your mast bast is far enough away for a ratchet wrench to work. on the C2/AHPC Capricorn the isn't enough clearance. I had to grind down the head of the wrench (as per attached photo)and it just fits now. problem is it would rust very quickly going anywhere near salt water.

Attached Files
20140617_224433153_iOS.jpg (216 downloads)
17mm ratchet modded

C2 AUS 222 by Goodall design
"Darph Bobo"