Gilette three-blade blue razor from 7-Eleven. 98.8% rigid as the two parts are molded separately and then assembled. But it definitely does not "swivel"
Not seen here, as in Indonesia, using the waste heat from the AC to heat or preheat water. Put a copper coil in a tank and connect it before the heatX in the outside AC unit,
Well, he's not in Chiang Mai but if you contact him I am sure he will recommend someone hear you. He does go upcountry to do group lessons.
How to contact him? Use the internet and your grey matter.