Ernst,
I know exactly what you mean..The one I built, and I'm an artist not an engineer, was made from various scrap parts. As I said earlier, I did publish, for those who asked, what I came up with.
It is a bit of a monster..not too proud of the design work (an old upper cabinet from the kitchen, parts from a golf cart, assorted nuts and bolts from everywhere! etc)...but is has done the job for well over a year. I would like to have the time to redesign it and add some pneumatcis to it. If that is at all possible...with my very limited knowhow.
Anyways thanks for considering it. Don't worry about posting if you are unsure, I'll jump in on my own at some point..nothing like a new challenge.
I have been fortunate enough already with the help and suggestions from this forum and all of you!
All the best,
Shawn