Today one of the armrests on our swivel seats decided that it wasn't keen on being in one position and made a break for freedom. I had my arm on the rest (passenger) going round a roundabout and I was supporting myself lightly on the rest when it suddenly gave way and now spins freely. I have noticed that there is a pin about 4mm dia. halfway out of the armrest. Does anybody have any parts lists, manuals or videos relating to the removal and re-instatement please?