Hi Laurence - hope you're well?
you can buy a split-ring from any fishing shop which will allow you to attach the original zip-pull and save any problems of removal from the actual zip mechanism. Should cost about 25p.
best
P
You've just said it is 'minty' and you now want to try giving it a 'Ding'. Young people today, just don't know the value of things. When I were little, I got an orange in a sock for Christmas and thought I were luckiest lad in't world.
As machines states, they're all different. I've never played a Bongo, but have owned the others you mention. From your original list, I'd go with the Ray, but then you dropped an L2500 into the mix. I'd go with that for maximum flexibility.