Thanks for all your comments Chaps!
Stuart.
I used Bluecol top up mix, in my Robinson engine. It rusted, immediately!
The O ring idea, didn't work. Leaked, again........
So, I filled the groove with Hylomar. Then wrapped around with thick cotton. To fill the groove a little proud.
Then applied more Hylomar, once it was through the first bore, before entering it into the rear one.
It worked........
Now, using coolant mix, at 10/1. No rust, so far........
Well........ It's
finally finished!
The sun was shining too brightly for the camera. The actual colour is Ford burgundy......
The duck, is in there, somewhere. The wind was a nuisance, too.......
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Thanks for following along!
David D