Digital BW, The Print

Hello. I hope you can help me with this one stubborn clog in K (black)
that won't go, in my Epson 1160 with MIS UT-FS inket.

I did a number of cleaning cycles (also with a flushing cart), tried
Windex on the parking pad, waited, cleaned the bottom of the printhead
with Windex, and finally injected Windex in the nipples in the
cartridge holder (several times, and I let it sit overnight). 
To no avail: I still have one gap in the K section of the nozzle check.

What more can a man do? 

Can it be anything else than a clog? Any use 'resetting' the 1160?

Please help, or I'll have to buy a new printer.

Thanks,

I g o r