We also played non-stop throughout the summer in the 70's… Hated when we ran out & had to use a cracked wiffle ball. Always tried different repair techniques (glue, tape, etc.) but nothing really worked.
We had a field set-up in my cousins backyard & over time we had established a ground-rule for anything that could possibly occur. The base paths were permanently worn & no grass would ever grow there. Everything was run out, anything off the house or foul was an automatic out (caused you to hit the ball up the middle). In the tree was a live ball & if you caught it, it was an out. Had a perfectly distanced fence that could only be cleared with a perfectly struck ball. We used old worn out gloves that helped you rob HR's by jumping high over the fence to snag a long fly.
The only thing that caused us to stop playing was when the Met's were playing a day game.