Blanchard or Surface grinder for this job?

[Frank Pratt]

A shop with a shaper or a horizontal milling machine would be the fastest and probably cheapest way to go. Both those machines have been pretty much forgotten in a modern shop. If you find a shop with them they probably started before 1950.
Bil lD

Check out the Abom79 channel on YouTube. He has an old shaper in his home shop & loves using the thing. They are pretty amazing machines.

[Brian Holcombe]

People still use Horizontal mills, plenty of guys on Practical Machinist that are into Deckels. I'd love to buy one but no space..

Anywho, those flanges are going to be pretty thin after whacking 1/8"....is there a coordinating part that can be shimmed out 1/8?

[Al Launier]

People still use Horizontal mills, plenty of guys on Practical Machinist that are into Deckels. I'd love to buy one but no space..

Anywho, those flanges are going to be pretty thin after whacking 1/8"....is there a coordinating part that can be shimmed out 1/8?

It appears the OP may have already started to reworks the parts (ref. #13, but I think your suggestion may be the best. That way the original integrity of the pieces are maintained.