I got used Vortex HD Razor in trade and although looking new, the previous owner had severely over tightened the turrent set screws and put deep dimples into the locking groove. It was impossible to zero the turrent when the set screws fell close to the dimples because the set screws would "walk" into the dimples thus moving the turrent about .25 MOA on the graduation scale. On Dec. 30 I sent the scope back to Vortex to see if they would repair it under warranty. Yesterday (Jan. 9) I received the scope back, repaired at no charge. They had to replace what I call the inner spools that go into the scope. They also cleaned and purged the scope. That is a 10 day round trip between Christmas and New Years Day and the return shipment was held up a day for a snow storm. That is was I call Fanatical customer service and surpasses anything I have experienced in the way of customer service before. What a model for others to follow if they want repeat business.