2000s

First of all before you can do this you must be able to do a 1990.
You have to know which hand you want to spin on usually the stronger
one. Ok now before actually trying this move first practice by doing
a regular handstand and lift up the hand that you don't spin on and
place it over your spinning hand palm over palm, and try to balance
like that for a few seconds, the longer you can stay up the better
and practice a lot. Now you’re ready to begin first start out by going
into your 90 and once you are in the air you lift up your non spinning
hand and you start to spin place your free palm on top of your spinning
hand and try to pull of some spins. This move is much easier than a 1990
but takes a week or two to get one solid rotation down so it shouldn't
be too much, just keep trying.