The 58 FI Corvette would not start but would start with shure start. So the starting waffer screen was blocked with carbon.
I unconnect it from the Vacuum T and remove it from the intake manafole.
I scraped the screen but that probably was not necessary!

I us a old metal film holder filled with carborator cleaner and soak just the screen tip.
Starts fine!

I once took one apare and there is a plastic like waffer inside to shut off the Vacuum when the engin starts.

That is the reson I just soked the tip that has the screen in it.
I wonder how many were trashed by people?
I know I bough new ones but probably have the old ones somewhere.