RE: two lines on Poulan 25cc from carb to tank !
The Horizon adapter looks much better, however, I don't know if the plug actually recesses into the adapter or if it rests at the same level as the other ones. My goal is to place the glow element in the cylinder at the same location as the spark gap. This should help with the low end idle. Further, I think that in order to make this happed I will have to create a tool to tighten the plug. The tool will have to be just barely larger than the major diameter of the glow plug. this is required because the recessed hole needed in the top of the adapter must be just larger than the plug diameter to insure sufficient material for the outer thread casing.
If anyone knows of such a tool please let me know as I do not want to reinvent the wheel.