Development was a long process. I initially got a set of drawings completed by a student engineer, then got the first parts machined locally here in Ireland. The parts were expensive to make here , so I needed to go abroad to get them made a little cheaper, but then I ran into some quality problems that needed resolved. However, I must say the company I worked with seen the potential and once I committed to making a reasonable volume (100 units) they worked with me to resolve the teething problems. Just to be sure though I personally check and pack each unit. The unit is still mostly made from machined aluminum parts and bespoke aluminum extrusion. So it's not mass produced and I do incur quite a few shipping costs, hence , sorry to say it is a little expensive, but does do the job when a decent drill is attached. Thanks for allowing the post.