I have an babylock ellegante machine and happen to have an extra needle threader. I won't go into why.
When I some how bent the one on the machine, I figured I had nothing to lose so I popped the bad one off (pushing it towards the back) and popped the new one on (reverse of how it came off). I thought it might not 'line up' properly, but it did and all was well. Just be carefull not to bend the tiny wire as you handle it.
You may not find info on the Ellageo -- but type "replace automatic threader" into a Google search and other examples show up -- including one for a Brother on YouTube that could be very helpful as Babylock and Brothers are often very similar.
Good l