ok
the head which you used is wrong head
you need a head from mono walkman,some old model, or buy some new micro cassette recorder.
the head is a little smaller but if you be careful you can find the rigth position.
i am here ....
on this stage ...
if you get some data out please let me know ssleeper@ymail.com
P.S.
i think this link will help you
http://lekernel.net/scrapbook/cardreader.html