I made a OA vaporizer last year using a block of aluminum and two diesel glow plugs. It works good, but won't fit in my five frame hives. so I retrofitted it to a blower/vaporizer , using an older smoker.
I turned the inner can of the smoker insert up side down to created a ledge for the heater to sit on.
Pic of the vaporizer as it was when I made it and then the retrofit.
I can now blow the vapor into the hive.