I was having a conversation with one of our mechanics about Visionary equipment and he was telling me that the Granite Gargoyle was known for causing damage to the lanes.  Has anyone else ever heard this?  Can anyone remember other balls that did the same?

I don't know about damage, but I do remember this. My father loved the original LT-48. He had 2 or 3 of them all drilled different. Even as resin balls were coming out, he stuck with the LT-48. The pro shops hated him, cause the rubber would smell so bad when they drilled them, lol. He used to bowl in old Fire Company lanes (back in eastern PA a lot of Fire houses had bowling lanes, usually only 4-8 lanes, in the basement) but also bowled in a regular center. That center went to synthetics and they made him stop throwing the LT-48 becuase the rubber would leave marks on the synthetic lanes. Every time he threw it, where it landed on the lane there would be a 2-3 inch black mark. He was so upset. This is going back a ways, like early to mid 1990's.