Need help to find very thin cross hairs

Find a Lyman Target Spot scope, probably from the 60's.
I've got a 10 X that has been boosted to around 20X on a Walther. The crosshairs are so fine some people have trouble seeing them and the spot in the center doesn't obscure the 10 ring on the 50 yard postal shoot target - about 1/8".
 
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