For the correct size graphite shaft extension we need to know the inside shaft diameter measurement at the butt end of the shaft. We do not stock either of these shafts for me to be able to get that measurement. I looked up the specifications for the 757 and 661 butt diameter and shaft weight and took other shafts that we have in stock that weight the same and have the same butt diameter as these two shafts. In doing that it looks like you would use the GW4000 extension and use the Purple coded extension for the 757 and the Red extension for the 661.
Date published: 2016-07-20