Thanks all for the comments! I thought of a balloon but as stated, hard to get one in the TT with the small holes:
The con to using a balloon was the risk of it popping from the edges of the screen. I wanted to use the screen to provide some support of the JBW. As viscous as it is when wet, it does tend to migrate while it is curing. The second hole had a much better result with the slightly extra JBW to file down.
PXL_20220923_121037321.PORTRAIT on Flickr
The next challenge is to determine what to do about this damage for chain suck! The black paint helps obscure the damage but the rough edges helps point it out. The damage looks like an extension of the dimple toward the shell
Any suggestions?
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