You could use a form a gasket to help seal that area, but it may not last. Have you considered drilling the entire broken bolt out and then re-threading the housing and using a different bolt? That is what I would honestly be doing. If drill enough of the bolt out, it should come out. If that doesn't happen (as you mentioned) get a drill bit the same size and the bolt and drill it entirely out and tap new threads into the housing and then replace the bolt with the new size.
Let me know if I can help.
Joe
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Thursday, April 23rd, 2020 AT 4:41 PM