Enough of a leak to be a concerning boost leak?

[toseland]

can make it out of some rubber, it will become brittle after a while though, multilayer steel would work but you cant get the torque on those little bolts really required to do the work necessary.


if you have a steady hand and a few hours to wait, spread a thin layer of RTV silicon (the black or orange stuff) on it and let it dry somewhat, then use a little more on the other face and then mate the faces solidly.