I bought my TF89 .22 and sent it to Gene for a Turbo Tune and you talk about a night and day difference, I had the grinding to and also after about three days worth of shooting my pellets started going everywhere, sent it to Gene it came back super smooth and Gene told me that the stock seal had torn up one side so my power had dropped and it was showing signs of spring fatuige after just 2 weeks, Gene installed the hand fitted spring guide,maccari spring and seal, when Gene tested the gun after his tune it was shooting 15.3 grain pellets at 830FPS which is 23.3lbs of energy after about 3 more weeks of shooting it has settled in to shooting the same 15.3 pellets(gamo hunters) at 860FPS which is a tad over 24lbs of energy and is smooth cocking, he also did a trigger job on the gun and smoothed it out nicely, I cleand my scope rail really good with goo be gone and used a leapers 1 piece mount and mounted up a 4X12X44ao Barska airgun scope and locktited everything down good and let it sit over night to set up, dialed it in the next day and its never budged since, I don't even use the stock scope stop, I just snugged the mount down really good and after Genes tune the firing cycle is A LOT smoother with no twist or twang, I absolutely love my TF89 now, Genes Turbo Tune made the gun, without the tune I doubt if it would have even lasted until now, at least Compasseco has a very good return policy, I wrote them and told them about the spring and seal and they offered to replace the gun or the spring and seal whatever I wanted but I told them I sent it off to get tuned and they sent me two of the same hats you got too.