Anyone have an Air Cut-off valve Honda Part #16510-MAL-600

[Valkahuna]

I've also posted this on the Florida board:
   
I'm just finishing carb teardown and rebuild. Now I find that one of my Air Cut-Off valves, item 24 on Honda Parts breakdown fails vacuum testing. I see no way to fix or rebuild it. Does anyone locally have one? Everything I order from Partzilla is at least a week out. I'm checking with my local dealers but they never have stock, so delivery still around a week and usually 20% higher price. Thanks in advance.