If as suggested by brother Geoff, try and find replacement parts. My Ace Bristol had the exact problem as your motor has but I still had the tube. I cut the broken cast alloy off square and carved out of a solid piece of alloy a new section and had the new piece welded to the original fitting. Some where I have photos of the process. If you decide that is the way to go contact me and I will pass on what I know . You only need round and flat files a hack saw and an electric drill. ( and plenty of time ).
Best of luck
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