Good luck. You can take the glow voltage up to 1.8volts, but should not need any higher than that. I normally use a Rossi #5 plug, but you can use any other plug with a reasonably strong filament.

BTW, it is a good idea to heat a plug you want to use first before you pull out the coils. This help not to break the filament to easily. Also make sure non of the filament touches the inside of the plug body.