Part are made to tolerance specs. This means the actual diameter of any particular points plate can vary from sample to sample. The same is true for the mount bosses on the engine case. Usually the tighter the tolerances, the higher the rejection rate of manufactured parts during quality control inspections. Throwing away parts costs time and materials, as does the inspection process. To save money, tolerances can be loosened, or quality inspections can be eliminated if it is deemed that the customer will buy the part even if the parts don’t meet exacting specifications. I suspect Diachi has taken this path with all their offered parts.
If your points plate fits more loosely in the engine bosses, it can change both the point gap and opening point as the point cam rotates, because the spring pressure changes during cam rotation. Anyway, the slots in the plate are there to accommodate position differences, and no part of the slot is off limits to achieve proper timing and gap.
However, if it bothers you, then re-use your old points plate. I’ve yet to see one that wouldn’t accept any points set and condenser ever made for this application.
Cheers!
