Not real sure I understand the question...???
Your year model has the pre-1940 "blind bushing" and your wanting to use the 1940-1948 "open bushing....
The blind bushing has a plate across its outside opening which the OEM case race bottoms on when pressed in. This plate has three holes in it for pressing the race out for replacement...Because the plate blocks most of the outside opening, line lapping is not possible....
And for this reason you want to install the later 40 and up....
Am I on the same page here with you so far...???
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Your year model has the pre-1940 "blind bushing" and your wanting to use the 1940-1948 "open bushing....
The blind bushing has a plate across its outside opening which the OEM case race bottoms on when pressed in. This plate has three holes in it for pressing the race out for replacement...Because the plate blocks most of the outside opening, line lapping is not possible....
And for this reason you want to install the later 40 and up....
Am I on the same page here with you so far...???
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