An improved golf club is disclosed, in which a desired weight for the club’s head is precisely controlled by installing into a hosel cavity a selected hosel plug from a group of such plugs having identical sizes but a range of weights. A polymer backbone is functionalized to irreversibly bind metals that are selected prior to use by the user. A routing table specifying a plurality of downstream switch modules, connected to the first switch modules by one or more ports of the first switch module, is identified. An interlayer insulating film is formed on the etching stopper film. Routing the signaling message to a point code in the MTP level 3 load sharing group may include replacing the destination point code in the signaling message with the destination point code of the node to which the signaling message is to be routed.