Does anyone here knows how to assemble/dissassemble this flexible arm? I purchase one used and the last plastic on the arm was broken so now it can hold the weight of the SL961 flash. I look for a user guide everywhere and couldn't find one. I need to know how to assemble it so I can use the last plastic and join it to the flash. I'll post some pictures about the problem. I want to use this arm with a DC1400