There are several Bendix magneto models. Look on bottom of magneto plate for
Make, model and usually serial number. Post that information.
KD3 used both Eisemann and Bendix magnetos...WD3 probably used same brands.but not necessarily same model magneto
What can you say about history of your WD3? Did it run, was it assembled
or loose parts, creative re engineered aka parts swapped
Did you have the magneto apart to clean and refinish

These are pretty simple motors with a low part count and not much that
can be assembled wrong (although the sequence of dis assembly and re assembly
can trip you up as can keeping track of which fasteners go where.
We can assume the coil, points, wiring and condenser are good to go...
Louis