Forget the jamming the star nut in, instead, find a Bike shop with a Bike Mine account,
BM in the US distributes BBB parts a NL based company,
Their BHP21 is a quill type internal or stem raiser.
It replaces the star nut, , so the star nut is not needed , their design uses a stem bolt,
of their design, which is threaded inside it's hex socket.
so the headset pre load adjustment is retained via bolt thru top cap.

I got one to restore height to a steerer tube cut too short for my needs,
and I got to add a 2nd stem to mount my handlebar bag upon.

BBB likely contracts thru Taiwan too, thats where the bike manufacturing capital is..
so retail price was about $23, same as other stem raisers on the market..

http://www.bbbparts.com/headparts_bhp21.php

as I used it, : http://www.cyclofiend.com/working/20...clark1008.html