There can be slight variations from one Axivcore to the next (ie: Black, Blue, Green, etc.) because they are different designs, specs, weights, etc. Also, the inside diameters can vary slightly. I always recommend getting one of each, the USGE and the GSE, that way you can use the one that fits the best. Generally, if the shaft weight is 65 grams or less, the USGE is the one. If the shaft is over 65 grams, the GSE should work. It may be necessary to sand the portion of the extension that goes inside the shaft down slightly if it is too large, or shim with a strip of tape if too small. The shim should fit snug. We do not recommend extending graphite more than 1".
Date published: 2014-09-08