Has anyone else had the problem with a leaking hot-end?

Just recently got a CR10 v3 with the Creality direct drive.
Due to not changing the filament correctly (I hold my hands up) I found I needed to clear a blockage in the nozzle throat, so I watched the short vid put out by Creality which all looked very straight forward.
I followed the steps and all seemed OK however after a while I found drips of molten plastic on a print. I thought I hadn't tightened the nozzle enough so gave it another turn or two until the nozzle shoulder hit the heat block. BUT it kept on dripping down from the top of the heat block.
So I had to take the hot-end apart to clear up the mess and found that the metal sleeve that the nozzle should seal against just backed off (unscrewed) as I screwed the nozzle in. I had to hold the metal sleeve with a pair of pliers whilst screwing in the nozzle in order to get it to seal.
To me the design looks wrong as there is not a hard-stop for the metal sleeve to lock against!
Am I the only one who has had this problem? In which case what did I do wrong?

Hi all. I recently got myself a CR10 v3 and having got bored of manually levelling the bed I've added a BL Touch.

So a few questions for you pros out there:-

• It is probing 25 times, which is a lot (compared to my Geeetech which just does the corners) and takes nearly 6 minutes. Is this normal? Can I reduce the number of time somewhere?

• Is there no need to probe at the start of each print (which is what I used to do on the Geeetech)?

• Is there a way of getting an un-compiled version for the firmware (cr-10-v3tf1.1.6.0bltouchv3.1.....hex) so I can modify some settings to speed the whole process up?

and a little gripe. Why is the BL Touch 3 times the price of the 3D Touch from Geeetech?