I have a Caldwell Rock BR front rest that I got second hand some time back and have recently upgraded my rifle and scope so needed to follow it up with a improvement to my rest to get the best out of all this good equipment as its the earlier model rest that had the top that pivots rather than smoothly amoves from side to side. Problem I was having was general looseness and side ways adjustment's always required an adjustment to elevation as well which made slight changes more involved than the should have needed to be. I looked into a complete new rest along the lines of a Sinclair or like but with our exchange rate and heavy shipping costs that didn't have the appeal when it came to placing an order. So the next best option was to look at a replacement windage adjustable top. Seems there was a couple available to go straight onto the Caldwell but I finished up settling on a Dan Greenlaw machining model. http://drgreenlawmachining.com/windage_top Read some very good reviews that spoke highly of its quality and functions as well as the good customer service. Waiting on shipping and keen to see and try the upgrade. knowing the Caldwell base I have is weighty and sturdy and will do the job. I will report back when it arrives and I get to put it through its paces.