[Arran]

I also have an H-500, I bought it as a parts set since I have a later 600 series T.O with a missing catch. The worst part of it is that the plastic fascia over the dial got melted somehow, the rest isn't really that bad. I remember restoring an older brand Z portable, one of the ones with the crescent shaped dial, and I touched up the leatherette/oil cloth cover with flat black stray pain, though semi gloss would have been a better choice. In spite of what some claim it is NOT Tolex, it's a cotton cloth with a coating applied to it, though it was probably more flexible when new. I also have a G-500, which I have read is one of the rarer post war models, I intend to restuff the bumble bee caps in part because of this, I already worked out the method by restuffing Sangamo caps, which are very similar in construction. By the way, if that's a sand resistor I would replace it, those are as bad as bumble bees for failing.
Regards
Arran