Block Front Fixing Lug Broken

[JonE]

why does it need to join? Bob's point of a "filler" at the same height in a similar material... that would just stop the tightening up stay horizontal - seemed sensible. A small metal block under the rim. Presuming that you are just getting this running and not spending your time but not a vast amount on it.
And keep to standard, low compression head, standard engine to take off any undue pressures?