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 :) :
Nikon AR-11 Soft Shutter Release for Nikon Df Digital SLR, Fujifilm X-T4, X-T3, X-T30 II, etc. Cameras (Compatible with all Mechanical Threaded Shutter Release Camera) - Others - ShaShinKi