Lobster wrote:

I've finally decided to enter the 21st century and give microbore copper
tube a go for some radiators I need to install.

Now clearly this stuff deforms extremely easily, but I'm mindful that I
need a perfectly circular section at the tips or my joints won't work.
Is there a way of protecting the ends or something, to stop
them getting deformed during installation? Or am I worrying over much?

It does tend to deform with a couple of inches of any bend. You can buy
tools to "re-round" the tube, but I used a couple of different sized
drill bits (the blunt ends, obviously). Just push in and wiggle
around...
Once you can get the olive/reducer on, it will tend to force the tube
to a round profile. BTW I also use a smear of Fernox LSX. No leaks yet.

-Antony