Trying to get the BSA A10 ready for the El Diablo . It feels like the points timing is off , but I can't get a deg. wheel on the crank because of the spring nut . So How do I check timing is there another mark somewhere . I know on the preunit Triumphs there is a measement on the piston crown from the spark plug hole . Is there one of those for the BSA ? And if so any idea how long and if it is timed in the advanced or retarded position ?