All W&G gear comes with teardown tools! Look behind of the previous one, there should be a gray box that contains spare fuse, hex key and usually hook for lifting boards. You also should be able to lift whole internal cage out after the top cover is removed. These are absolutely fantastic gear, sadly most of them were made for analog and early digital POTS network measurements, so many of them are obsolete at least in their original use case. I have disassembled couple of W&G T-carrier analyzers, both had failed due leaky NiCad batteries. I still have the cases around as I was planing to make kick-ass computer case out of them.