How Much Water 1 Less Rad + How Tight Is Too Tight Radiator Nut?

Hi, I totally drained my system and looking to reconnect 6/7 radiators in my house (still decorating small bathroom with small rad) 1st pic is of my boiler. How much water should I let in via the loop with one less rad? ....... Before I put it in towards the top of blue, but when the system went on - it went well into the red, so assume I should put in less??

2nd question, when putting rads back on and screwing the nut, how tight is too tight/lose? Here is 4 pics of rad nuts I have just tightened by hand so far (know I have to tighten my spanner until tight). Is showing a little/like 1 ring of thread still OK?

Thanks!

 

Tight enough so they don't leak . Re- pressurise the boiler to no more than 1.5bar, should be shown on the right hand side of the display, then open one rad and valve at a time and check for leaks. That way if it leaks you only have that rad to deal with.

 

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