Just ordered my Plugr 850HD and should be here in a few days. Do you guys break many tines during operation? I ordered a couple of spare 5/8 tines. I was just wondering how fragile they were when hitting a rock underground. At the golf course where I work part time, we break them often when doing deep tine aerations, but those tines are much longer and thinner and prone to breakage. I was just curious as to some other operators experience. Speaking of tines, has anyone found a place to buy tines other than PLUGR? They are quite expensive.