This has worked for me on cowled 4-strokes: take a short length of brass tubing; slip it over the glow plug post, but leave 1/8" or so away from plug body; lightly crimp the tubing with diagonal cutter all the way around, squeezing the tubing into the concave ring around the glow plug post; maybe make two crimp rings; now pull the tubing off the glow plug; take dremel cutoff wheel and run a slit up the tubing maybe 3/16" from the end; this will allow the tubing to flex somewhat, and snap in to the indentations on the glow plug post; squeeze the slotted tubing down to get a snap fit onto the glow plug; solder your igniter wire to the tubing; bend the tubing 90 degrees if that helps your fit under the cowl; slip a piece of heat shrink over the tubing to insulate it from the cylinder head; snap it on, and see if it won't work.