Please choose the correct solution to the question: How to Make a Sponge Motorboat

Solution1: To make a Sponge Motorboat, first build a propellor by cutting off a slice of cork from a wine bottle and push it on your motor spindle. Make sure it can spin freely.

Solution2: To make a Sponge Motorboat, first build a propellor by cutting off a slice of cork from a wine bottle and push it on your motor spindle. Make sure it is tight and can not spin.

Answer format: solution1/solution2
Answer: solution1