I do this too, kinda. I drill and tap the hole for 4-40 then just screw in a hex screw. I do this for cowled engines and I also use a fired 22 shell. I drill out the shell case and run the 4-40 through it and tighten it down, I have to cut the screw to fit though so the shell is tight. This way when I slip the hex head wrench in that dark cowl it's a hard target to miss and the wrench doesn't vibrate out. For the low end I went to Sear's and bought some very long screw drivers, I have several inches between my hand and the prop.