A big thanks is owed to Don Battin down at Pipe Dreams Marine.
I had a couple of cracks in my t top joints. I brought it down to Don and here is what he did.
1.He repaired the cracks.
2.He put a new small gusset in each corner (see below picture)
3.He tighted down the t top so that there were would be no more play between the frame and the top, and he advised me to do the same.

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Great job. Thanks Don.
Peter