filler neck modification

Many of us know about the dreaded filler neck angle in early valiants and probably others (i own a 65 valiant) that does not work with todays pumps, forcing us to hold at 45-90degrees. I know there is a company that will modify tubes (name excapes me) for what I remember to be a rediculous amount of money.

Today I scored a filler neck from another 65 that was in the local junk yard. Does anyone know modify them to work like they should? Possibly pictures? I'm a welder and metal fabricator by trade so this is right up my alley. I was thinking of inserting a washer like plate that has an ID just a bit bigger then the OD of the pump. And down further was thinking of using some screen (expanded metal) and roll it to be a little smaller then the tube itself to act as a baffle. Any suggestions or experience on this subject?
I haven't found the filler tube modification but I did find the one where you put in the flap(looks like an unleaded part in the newer cars) I have done it on my 66 but have not got the car together to test it out.here's the process . it's a pita to get it in but once it's in it doesn't move.
I hope this is readable
View attachment gas tank sentry.jpg