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I've dug out some more information on Mr Elmer Wall from a 1933 Model engineer Magazine and it appears that this engine was available earlier than I thought so have updated my first post in this thread accordingly Jo
Hi Big E Pleased at least one person is interested in this engine I was getting worried no one was interested after I suggested this is not a pretty engine
As for the casting squareness problem maybe you should have made them from bar stock?
What is the ali like to machine hard or gummy?
Alternatively give them back to your little custodian to let them age for quite a few more years until you retire