I have determined that I have a 1928 Buick distributor (Delco-Remy 640a) grafted into the generator housing (no. 317) of my 1926 standard coupe. The advance plate has been crudely welded to the distributor housing and there is no timing nut below the gear. In addition, the unit sits rather loosely in the generator endplate. (see photos) My questions are why would someone do this? Is the gear teeth on the '28 the same as on the '26? How do I time it without the nut to loosen the gear? (The '28 g