Morris Minor Owners Club

I'm in Gilbert, Arizona. I'll be looking around town to find something to help remove the plug.
If I can't get it to move I may change plans about installing the temp sensor.
The engine serial number plate is CME-U-H 411.

I'm just not able to remove the slotted cylinder plug. So I'm going to use... "modify a bottom hose w/heater take off, replace the top hose with this modified hose, and insert the temp capillary sensor into the shortened heater take-off hose."
Do I seal the capillary sensor with just a hose clamp ( I don't want to crush it ) or should there be an adapter with an external screw thread on each end. (This would normally screw into the sensor hole in the thermostat housing or cylinder). Then the capillary sensor fits into the hole through the adapter and the nut on the sensor screws onto the thread on the adapter. Or some other adapter configuration like a female to hose adapter(see pics). Then I could tighten a hose clamp sufficiently to prevent any escaping water under pressure, without crushing the capillary sensor. Where do I find the adapter? part name and number?
Please comment when able.
jimj67
Minor Friendly[frame][/frame][frame][/frame][frame][/frame]

Here is how I fitted mine on my 948cc engine, similar to how you want to fit yours.
http://www.mmoc.org.uk/viewtopic.php?f=11&t=46293

On my Series MM I had a threaded hole fitted in the radiator header tank to fit the sensor. Points to note - It needs to be as low in the header tank as possible. The temp only registers when the thermostat is open so when the engine is hot there is a few degrees movement as the thermostat opens and closes and if there is a loss of water then the gauge temperature will drop when the sensor is not immersed.