I love the one that came with my Singers XL5000&6000:
http://cart.jennys-sewing-studio.com...oducts_id=1553


That looks OK, but it's flat, so I still would have to use my other hand
to change my grip every 180deg.

But your question encouraged me to do a search. I may invest in one of
these:
http://www.cmlsupply.com/right-angle...Fe-DQgod7W0AXw


Pretty good price too.

Once you break them loose they come out easy with fingers only.
My 12 inch has not failed me ever. At least not in 35 years.


My fingers are not so nimble. The Singer hobby model only has 2 1/2" of
vertical clearance and a bulky housing directly above.