David_T
Funditor Past Moderator
  
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Hooked on Sling'n
Posts: 760
Greenville,SC
Gender:
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PS
For those impatient ones like me: I cut most of the way through the tennis ball, smear a little grease on the inside to prevent possible sticking,mix concrete just wet enough to mould with hands, fill tennis balls full of concrete, squeeze in hands to work out extra concrete until the edges of the tennis ball are touching, shake it up to be sure it is all one solid piece, set over night, carefully pry open, let dry for a day or two. Remember it takes 28 days or so to fully harden. I have slung them in the open dirt field after three days and they don't break.
Happy hunting!
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