I think the key is that the Fat Mac is a very large chunk of solid metal. I've got a glass walled electric kettle and so when it is boiling I know that is 212F, I can touch the side of the kettle quickly, maybe 50 milliseconds without burning myself. If it had to be heated to say 300 then it would be not so easy.
Anyway I'm hoping to be able to produce lower temperature more buttery type if possible, so I'm only wanting around 180 to 200. But the main point is twofold. 1 It's a big chunk of metal that will cool slowly. and 2. Trial and error will eventually result in repeatable temps.
The only thing we really want to do is have a repeatable condition, with regards to time and temperature so that once we have found what works it can be duplicated. With such low temps I can see this would be easy, especially as it could be pre heated.
With regards for the temp held for 90 or 60 seconds that pretty well happens at the end. By the final minute you only have the last quarter or less to press out, by that stage the entire device should be at the temp you want then just squeeze slowly for one minute.
I don't think this is necessary but what I can also do is I can paint a patch on the outside of it with some black muffler paint, that will create a target for my IR thermometer gun.
