Ok. Here is the info from Sam's # 41. Sorry ... I screwed up when I edited my post and said it takes eight batteries (it takes 10... my bad). BTW ... twelve 1.2 volt nicads should work too. I don't think nicads were available in 1971 which is why they weren't shown as an option in the Sams - 399
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you'll still need 4 batteries in one of the grooves which is still too long if you only use ten and three each in the other two. AAA batteries are the same voltage as AA type but are shorter as well as thinner so you could try those with a tinfoil wedge if needed to make up the extra length.