Hi All,

I'm installing a downrigger to catch big salmon.  There is an existing
aluminum plate aft of the spinnaker winch that I'm removing and replacing
with a larger one.  I plan to use the same hole pattern so I don't need to
drill new holes.  The original plate had no backing on the underside. Not
sure what it's purpose was.

Looking for some input:
1. Is a backing plate needed?  The nearby winches don't have any backing
other than washers.
2. what should I use as the backing plate?  Marine plywood?  Would normal
plywood be okay?  Getting aluminum made to exactly fit there would be a
challenge I think.  With wood I could craft it at the boat for an exact

Some links to pics:
Original plate from top: https://flic.kr/p/24BK3KM
Backing/underside: https://flic.kr/p/Gu1cqL
Nearby Winch underside w/o backing plate: https://flic.kr/p/EXCp5P


 C&C 34-1 #041
  Vancouver BC

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