Hi Strat,
I have had a Davan machine for around five years and find it an excellent machine. It comes with two pens and you have two connections for them. You just switch power from one to the other. The power control is excellent so you don't struggle to control your 'burning'. You can work on tissue paper through to deep dark lines on hardwoods. And the kit included several 'points' to get you started but they are easy to make yourself, or you can use other commercial points.
You are right in that it is/was made by an individual. The contact details I have for him are:- Johnathan Roberts, Compton House, 13 High Street, Tywyn, Gwynedd LL36 9PF Tel. 01654 710888, but those are from about five years ago.
If you are anywhere near Burton on Trent, Staffs. I would be happy to meet up with you and let you 'have a go' with mine.
Hope that helps.