Post 247093 (https://www.thevespiary.org/talk/index.php?topic=6331.msg24709300#msg24709300)
(lugh: "Re: Drying Ether With NaOH", Chemistry Discourse) uses USP ether, which isn't the same thing as starting fluid. Starting fluid often primarily contains aromatic hydrocarbons, not diethyl ether, and propellants. Aromatic hydrocarbons won't support a grignard reaction :(