Today I learnt that the flange nut that holds the carriage lock pawl to the frame of the Olympia SM3 is an eccentric nut, so you can adjust the position of the pawl up or down, forwards or backwards. While I can very much understand why it would need adjusted up or down, so it lines up with the slots in the carriage rail, I could not, at first, figure out why you'd want it adjusted back/forwards. That is, until I put it back together and the little tab where the spring attaches started binding against the frame, jamming the carriage lock in the open position. Hopefully this will help fellow tinkerers who might be tempted to form the tab out, with the risk of damaging the carriage pawl on their machine.