On September 22, 2014 at 21:20, jimstolz76 said...
Where are you seeing the 5x20mm dimensions?
Before I read down to where someone posted the back panel illustration, I downloaded the manual and looked at it. The dimensions were given in the manual, but I can't tell you where.
The issue is there are two metal tabs that lock the fuse holder 'cap' inside the chassis, and they are broken, so there's no way to lock it in place...
So, yeah, the thing has to be unsoldered and replaced. If I were you, I'd take it out, take measurements, take a photo or two, and use MS Paint (because you don't need a graphics program any more complicated than that) to label dimensions on the photo.
Of great importance is whether the mounting hole is circular or a D shape, that is, flat on one side. I recently bought a 5/8" dia D type fuseholder and had to glue the damn thing in because you need a punch to make that hole!