I added a new custom insert to my spider putter .This was 3d printed by someone I found through eBay which turned out to be the first one that he has done .Yet to put the shaft back on so I’m not 💯 sure how it feels but from throwing the ball against it I think it sounds pretty good and a bit firmer than normal .You can actually make any shape or size insert by simply removing the current one, scanning it into a scanner and then sending it over to the guy that made these .It fits perfect and it