[Leica] Quick question for any M5 shooters

[B. D. COLEN]

Howdy all - Having returned to shooting a film M, I find myself with a DUH question: Are there any M5 shooters here, and if so, can anyone tell me the  trick for framing vaguely accurately using a 21 mm finder in the M5 shoe, given how far off center it is? 

Thanks much

The photographer formerly known as Dr. Blacktape

B. D. Colen
A Day In Our Life (r)
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