I have a 1.69 oz (50 ml) tube of Permatex Thread Sealant #56521.
It has been used once to seal two metal QDs that I installed on my 12GS (which also had the flange cracks). There is plenty more in the tube (at least a dozen and probably many more QDs), and at the cost of some $17+ for the tube, it is a shame to go to waste.
We ought to 'pass it around'.
If you need some, let me know.
For $5 and shipping its yours.
Then you can make similar arrangements with the next inmate.