Unfortunately early Com-Pac's had some steel thrown in with the concrete, in my case it looks like scrap from some sort of stamping operation, the pieces got wet at some point, rusted, swelled, and not only broke-up the concrete, but must have frozen and split the outer hull on the port side of the keel. What a mess!

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2002 Ford ZX2
2 x 2013 Honda Civics

Oh yeah I have seen that! Spring for lead if you can next time around. A bucket of lead and some more concrete should work better.

My spring projects are to work on the SDL some more, redo my room. I'm going to do a bit of traveling as well. Should be fun.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200