Our league is having to buy a new pitching rubber. We purchased a $20 with the 3 spicks in the bottom. It lasted 1 week and broke while being pulled up. We have 3 different age groups using this one field so we have to move the pitching rubber from 35' , 40' , and 43'. Know that they have to be moved a lot, does anyone have a brand and model they highly recommend. Hopefully one that last more than 1 week. Thanks.