Hank, I know you have an older model 337 that is likely different, but the newer models don't use "D" batteries. Speaking for my 1978 P337H, there are 4 "C" batteries.
I did a search and found no good photos of the battery location, only some very dark, blurry attempts that I felt could be improved upon.
A site like this will often have several threads on one subject, but by reading them all, one can gain a unique perspective from each OP, resulting in a better overall understanding for the reader/member.
Cheers!
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