I use the "push and twist" type head lock glow plug connector by Model Products mostly. It is a snug fit inside the plug adapter shell, but it works and doesn't require modifying the adapter. There is a cheaper one, (about 5 bucks) from MPI that has a rubber boot and is a 90 degree type. It works fine as well, but you have to cut a slot in the glow plug adapter for the 90 degree portion of the connector.

Even Walbro states in their technical manuals that for a good transition the engine has to be adjusted richer than a perfect idle mixture. I have found that with Gas/Glow it needs to be slightly richer still....

On board glow power at idle does make the mixture settings less finicky though, and it's kind of convenient as well to just flip a switch instead of hooking and unhooking glow power to start the engine, especially on an inverted, cowled installtion.

AV8TOR