If correctly attached it should be more secure. The last time I looked, two of the three locking screws had dropped out of my own chuck, sucked up with the shavings no doubt!
I agree though, it will be a bit of a faff taking the locking ring on and off.
I expect many new lathes will now come with this spindle thread?
This is my old AT1416VS.
![](https://i.postimg.cc/sf95nW5k/FF81145-C-FD21-4025-B012-0-CBD427835-A2.jpg)
And this from a German website of a similar type lathe.
![](https://i.postimg.cc/pdH21mfS/82-B8-C3-B3-6371-4-F15-BD13-0-A8460637656.jpg)
It looks like the old M33 x 3.5 chucks will not fit ASR-Eurolock spindle lathes.