G'day Stu.
Sorry I didn't know that housing was cracked. I know how to fix it. Cut those lugs off, and spot face a flat land onto the housing just above the crack. Then replace those lugs with some thing that's a bit like a milling clamp. You see every similar clamps on some vices. Still use the tapped holes for the hold down. A stepped clamp, that presses down on new machined lands. There's plenty of meat there.
Attachment 292475
I was back in the shop by 3.30.
Phil.