I have a pair of ‘91 RRC hunter manual cloth seats I recently acquired to install in my ‘96 D1 and have only one problem: the seat backs do not recline and the adjusting knob on the seat bolster spins but no result. I can see a geared cam at the bottom of the seat back but no movement when turning the knob. Has anyone effected a repair on these seats or have an exploded diagram so I can fix them? Thanks in advance. Latarheel