Um well No I haven't (em ducks to avoid Randys Punch!) no I've been going to sense day one but still haven't... the bolt does Rust and probably adds Shit to the electrolyte and that electrolyte will magnify anything in it, so its best to change the bolt for stainless steel as Randy has been telling me to do for months now !
so I suggest you do it first off Tink to avoid contaminating your Electrolyte. it will help in
making less goo !... the wing nut you can use sense its on the outside...
but the bolt head needs to be coated if nothing else.... !
( fiberglass that puppy in and seal it off ! ) HAHAHHA
...cover it with RTV silicone maybe ?
J.B.WELD it ! smother it in J.B.Weld !.... ( at the price of J.B.Weld you can buy 6 SS replacement bolts ! HAHAHAHAHAHA)
...would you believe I had to pay $7.99 for a tube of RTV Silicone

the high heat type (RED).... it used to be $5.99 and that was High ! geeeeez !
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And Tink... wire a safty wire onto that pop off cap or tie a cord to it so you don't loose it when it does pop off !
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( I just wrap a hunk of bailing wire around the wing nut myself!)
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Bob........