This and their associated key, the No.2 tool are exactly what I am after. Interest I was thinking they would be quite a lot easier to use. Personally I find the combined tool a constant frustration as I invariably move the adjustment screw, or the drum as it sighted the locking ring, so bing able to hold screw and drum static while using a separate tool to lock up seems far more manageable.... but maybe I am labouring under a miss apprehension. .