Can't help much I'm afraid, although it could be worth going into your local tackle shop for ideas - may be possible to use one off another reel, you never know. Or keep an eye out on ebay for one, for spares - I just googled and there was one sold on there back in November. I know what you mean about just wanting to get it working, I rather like some of those old Daiwa's, boyhood memories an' all that, I've got an old basic (rubbish!) 70s one upstairs from my yoof

Don't those spools look narrow by modern standards?