Trimpe's Business ph. (812) 522-1398 Home (812) 522-6036 (Mr. Ralph Trimpe) I thought the were really great to do business with. Mr Trimpe told me how to check my concave for wear before I replaced it. I replaced my cyl. bars with trimpe's last year, and I was very pleased with the preformance increace of my 6620. Well worth the money!