I have just purchased a Tilley PL53 lantern to add to my collection. I am hoping that someone will be able to help me date this lamp. It would appear to have a Brass tank but I am unable to find any identification letters or numbers. Could someone recommend a way to clean the tank without me using any abrasives on the tank to try and remove some of the staining from the tank? Also some advice on the two side handle supports - When they are screwed finger tight they do not align properly (they go too far round, hope that makes sense!) By carefully bending the eye part I have managed to separate the handle and my question is this-should the screw bush slide around the wire? They don't appear to be welded but before I put them in a vice and tap with a rubber mallet with a wood block to protect the end where they screw on the font are they meant to be fixed in place?