Necchi S34 - 3 or 4 Thread Convertible Serger with Exclusive Bonus Bundle

This serger is impossible to thread. Maybe there is a magical way of doing it, but it's not clear. I've owned other sergers and quickly learned. Also - the needles are not universal and aren't available in my usual go to store for sewing supplies. The space to the right of the needle is very limited. The pros -- it was packed nicely (made it easy to return).