A little bit older mechanic at our local lanes who has been a great friend and inspiration to my 16 year old son (and very kind to the entire family) related a story to me about having had a Roto Grip SD-73 that was destroyed in a malicious accident years ago.  He has done so much for my son, and my son has worked a lot this summer doing landscaping in Texas (HOT!) while he pays for his bowling and training.  I've read about the balls and wonder if anyone out there could guide me in trying to track one down for the bowling alley mechanic?  He (the mechanic) will be retiring in a very few years and I'd love to give him the ball as a 2020 Christmas present and to say thanks for all he has done looking out for my boy.  I'm not a bowler and don't know if a post like this is allowed, but if anyone knows of a reputable seller who has one, please let me know.  Thank you.