So I just sent off an e-mail to RCBS along this line: My Rock Chucker Press is less than 1 year old. All dies used are RCBS brand. I'm having some issue with tightening of brass set screws on dies. If I set the die to where I want them (any die of any caliber) and then tighten the large die nut to secure to the press and lastly set the brass set screw to hold this setting all works fine until I loosen the die and start to unscrew the die from the press. When I do this the brass set screw does not hold the die nut in place, it's actually loose on the nut to die. My concern is that the press threads may not be in perfect alignment with the die and puts it in a slight bind which when the die loosens is shown in the brass screw to nut to die area. I've tightened the brass screws with RCBS wrenches until I've stripped them out at the wrench end and still are loose when the nut is backed off. If I back the nut off just a bit and then tighten brass screw they seem to hold from then on but then I always feel like I'm giving away the fine fine tuning adjustment. So what are your experiences?