The trick to keeping the heads from turning is to use a BFH. That's a  
really big hammer. Drill the holes and place the bolts in them on the mounting  
brackets. Use the hammer to recess the bolts and then install the lock 
washer  and nut and tighten away. The hammer does the recessing and the 
tightening  brings it even lower than the surface of the board. If you can buy boards 
that  are still wet from the treatment process they work the best. 
 
Rummy
 
 
In a message dated 9/8/2012 12:31:35 P.M. Eastern Daylight Time,  
billpauer at gmail.com writes:

I just  replaced the bunks on my trailer two weeks ago.  I did not try   
to bend the boards, and one thing that did give me troubles was   
tightening  down the carriage bolts.  The boards and the  brackets are  
not in the same plan until the boat is sitting on the  trailer.  I  
thought I had them as tight as they would got (the  heads will want to  
spin) but once I put the boat back on the railer  one bolt was not  
completely tight.  With the boat and new  carpet back on the bunk, the  
carriage bolt started to spin and I  don't have a good way to tighten  
at this point.  If I had to do  it again I might try to bend the bunks  
in some to help with getting  the nuts as tight as possible.
Good  Luck,
Bill

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