I've not taken one (engine stringer) apart, but in other areas that I have inspected on mine, there is fiberglass and more fiberglass... well over an inch thick in some areas.  I guess back then they were not sure how much was enough...  You may find some epoxy saturated plywood...but I doubt it.  Which is actually good news as you can grind it out and glue it back together.... just time and really messy effort in a small space....if you have to.  Try the re-tapping 1st.

Hope it all works out.

Cheers,
  Jeff Nelson
  Muir Caileag
  C&C 30 - 549
  Armdale Y.C.

On 2023-03-10 09:11, Rob Hamlin wrote:
Thanks Jeff that was my other question, what’s under the fiberglass.

Yes I was able to get the bolts out.  Good thought on retapping and larger size.

-Rob

Sent from my iPhone

On Mar 10, 2023, at 7:43 AM, Jeff Nelson via CnC-List <cnc-list@cnc-list.com> 
wrote:

Well that's going to be fun.  Have you been able to take the old bolts out, 
and is it possible to tap a new thread
next size up?  That would be easiest solution.  Otherwise, Major 
re-construction in your future, I see.
Good news, If yours is like my 30, it is a big mass of fiberglass topped with a 
steel plate.  Maybe you could wap
it with a new steel plate and through drill it from the sides to secure it.  
Otherwise grinder and lots of new
fiberglass.

Cheers,
  Jeff Nelson
  Muir Caileag
  C&C 30 - 549
  Armdale Y.C.

On 2023-03-10 06:17, Rob Hamlin via CnC-List wrote:
Hi
I’m replacing the motor mounts C&C 37+, Yanmar 3HM35F motor.

Removed the two back mounts, looks like they are held in by machine bolts into 
bed.  The front two bolts holding each mount were stripped.

Question, anyone else came across this? thoughts on solution to re-fasten/bed 
the bolts.

-Rob
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