Re Chrome a sleeve
Hi Jack Jet - If the chrome has peeled, you will have to remove all the remaining chrome, right down to the brass, and rechrome. If the liner is aluminum, you can't rechrome it directly - chromium won't plate directly over aluminum or its alloys. You have to apply a zincate layer first, requiring a special bath, but this is not terribly difficult, once you have the bath, and no electric current is required - just dipping the part in the bath for a minute or two, then stripping the zincate in 50% nitric acid, and re-zincating, to get complete coverage of any area missed the first time. But this is getting a bit too complicated for most modelers - best to start with brass liners - plating them is like falling off a log.