I did wonder if that might be the case since Boge cartomisers seem to work totally fine on those devices that I have here. I have been told by Steve that as they were specifically designed for Joye 510s, sometimes other 510 style atties/cartos can just need a little bit of working in, but it doesn't damage the device in any way.
Yes, I do intend to do spares kits, I didn't order them this time around because of time constraints and also because I am supplying a full kit (including spring) with every device I sell.
Not yet sure on the different style atty caps, that's a lot of spares to keep in stock if I were to bring those into stock and they are kind of pointless with the choice of adapters we have these days. My short 510-901/808 adapter for example, is pretty much invisible in use....... Plus, I believe there may be an issue with the PS 901 cap with RN atomisers (and cartomisers).