Hi all.
Another simple solution to the loose trem arm is the Boots chemists product "Zinc Oxide" plaster tape. It's £2;09p per roll and you get five mtr's on a roll. you only need a piece one and a half cent mtr's long to sort out your loose arm. You have enough tape on the one roll to do over three hundred loose arms. Wrap it round the thread about two millimeters in from the end. This allows the arm to pickup the thred into the block. Screw the arm into the block until it's where you want it.
Regards Geoff.