I have a half recumbent tandem bicycle. The front fork headset (under the front cyclist) is loose: I can feel some play when I put the front brake on and try to move the bicycle front and back. I tried to tighten it with no success. I disassembled it and was surprised there was no upper bearings. Could this be normal, given the bicycle geometry (not much clearance between the front seat and the headset and no need for a stem) ? I found some kind of seal which was torn out. Could this explain the loose headset ? Any help would be appreciated.
NB: the bike frame is from Bilenky (viewpoint) but the set up was done by another company.