Option 1:
Drill it out 1/16th undersized and re-tap the hole to remove the residual bolt threads.  You can drill a pilot hole and work your way up if you like.  Using left handed drill bits you might get lucky
at some point...but I doubt it.

Option 2:
Drill it out using an oversized drill, re-fiberglass the transom and start over.  The boats are plastic, and can be glued  back together indefinitely.  Obviously to make it structural and cosmetic, some
skill is required with Fiberglass.

Cheers,
   Jeff Nelson
   Muir Caileag
   C&C 30 - 549

On 2021-07-20 3:41 p.m., Bill Coleman via CnC-List wrote:

I have a Broken ¼ - 20 broken carriage bolt with around 2 threads showing out my transom.

1 ½” is embedded in epoxy. An easy-out seems unlikely.  I did four, three of them unscrewed successfully, but apparently I didn’t coat this one thoroughly enough with the Vaseline.

I am thinking that if I can heat the bolt up to around 300 degrees or so, it will break the bond with the epoxy. A soldering iron seems **maybe** possible, but that is only one side. I was wondering if I could heat it up, like plumbers do with welders to melt frozen water lines, it might be an option.

But I don’t understand enough about electrical resistance to know how to go about it. Using a battery for juice seems risky, having seen what happens when I have shorted them out with a wrench –

I do have a 30 amp adjustable Powerwerks power supply, which seems a little safer.

What I don’t understand, is if I can put a positive on one end of the bolt, and negative on the other, will it heat the bolt, or will it just melt the insulation off the wires? Or ruin the power supply? Or is it a factor of the gauge of the wires?

Bill Coleman

Entrada, Erie, PA


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