Post War 41, 51, Etc. Type Switchers Question

Former Member

I have been buying and looking at not only post-war but re-issues of the Vulcan type switchers, like the Navy #51 or Army #41. Some of the motors have closed brush holders, while most seem to have open brush holders. Was there a design change at some point ? What, is any, are some issues, pro or con with each type of holder ?

An example of each

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1/15/1810:53 PM

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