[19Fordy]

Following (with "thanks") the instructions of Fordbarner Ed Pitts first buy a new starter for a 1964 Ford Galaxie 390 V8 (like the one shown in the first photo) and then do the following:
1. Remove long bolts.
2. Slide out armature.
3. Remove long bolts from your 6V starter and slide out armature/Bendix.
4. Remove inspection band from new 12V starter and pry of end plate.
5. Clean out commutator slots (not armature) with needle knife file. NOTE: I have since been told that commutator slots should not be cleaned as the copper dust can create problems later on.
5. Slide old 6V armature into new 12V case. ( I lost count of fives.)
6. Install each brush onto commutator using home made "hook tool" or wire ties.
7. Align end plate on case and secure gently with vise grips. Install nuts on
long bolts to hold it all together.
8. Make and install clamping strip to hold front end plate to case. Be careful not to drill holes thru case and into field coils. Use the path of the long bolt as a guide as there are no field coils where the bolts pass thru.
9. Make and install new data plate telling what parts were used to make starter.
10. Install inspection band and test starter.
I hope this helps folks who want to "convert". The OEM starter fit the 1949-53 Ford/ Mercury V8. The new 12V starter is for the same engine. Total cost was $75 for the new starter from Ebay.