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doh, thank you for letting me know! you are correct. it seems i uploaded my first version which i actually did have fabricated and found out the flange was very much necessary...
i just uploaded a new file https://www.richsnapp.com/files/19to10inchRailWithFlange.zip and I updated these links.
Rich this is fantastic, I downloaded the file however there is no flange at the bottom in the .zip archive that you attached. Just wanted to let you know