Richards suggestion of as high on the can as possible, plus unreasonable torque, did undo the oil filter without piercing the canister.
On the temperature gauge I decided to have one more go at soldering it. I don't have a hotter iron than the 60 watt one, so a fair distance from the bulb, I heated the tip of my electric soldering iron with a blowlamp. This amount of heat seems to have sealed it this time. I did not try warming the bulb as you mentioned above, Meg, because the gauge dial does not go down to ambient temperature anyway, so a lower than atmospheric pressure in the capillary tube might actually cause the needle to bend backwards against the low stop.
Oh well, however when put in boiling water it only gets as high as 190 deg F, which I suspect means that there is not enough ether in there. Anyway It will do for now, I'll improve it later. I had to fit the instrument back in the car because I do not want to try starting the engine with a new cylinder head without an OIL PRESSURE gauge, and of course the are both in the same dial.
Today would have been the day when I first tried starting the engine, but alas I could not find the eight nyloc nuts and copper washers to hold the cam cover on. I thought they were lost, so I went to 3 places selling nuts & bolts,
A Motor factors advertising "Any part for any car" but they only had metric nuts
Halfords ... metric only
B&Q .. metric only..
One little gem though, was that I found a really nice aluminium non-return valve in the motor factors for a few quid. I think it is intended for a fuel line, but it will do right well as an extra NRV in my vacuum line for the headlight lifters. Yesterday I had also washed my T-piece with built-in NRV in soapy water overnight and that is working quite well too so with the two I hopefully will get a really good vacuum system.
Anyway after supper, I went back down to the garage & had a good hunt around and found my missing Nyloc nuts & copper washers all done up in an old rubber glove. So the cam cover is now on and the oil & coolant are in, but alas I could not be anti-social and try to start up the engine at 23:00 in the evening. My neighbours go to bed before then.
I plan to rotate the engine on the starter motor with no spark plugs in place (which is a quite noisy operation) to get the oil circulating and fill the oil filter before I try to fire it up on fuel. Methinks I should have filled the oil filter canister before I screwed it on, but I forgot.