through the Nikon F-Mount - remote controlling your Nikon SLR or DSLR
So, i ended up with another f90. The seller gave me another working, pristine camera for free AND paid for the repair for the other broken camera, feeling good today :) :
10PIN Cap Kit Suitable for NIKON F100 F90X F90 N90 N90X F5 F6 D300 D800 D700 D500 D810 D850 D6 D5 D4 10-PIN Sync Pc Flash Cap MC-30 Remote - Etsy
Npc Nikon F90 / For 90 Polaroidkassette II - Pola Back - Film Magazine | eBay