Thank you for your prompt answer!
Yes, it's a shame I missed it. It's a search I try from time to time, but with few hopes of finding it; actually It was a surprise to know that recently there were any at all! Obviously my searching method -lack of- is not good enough.
Of course I took for granted that the original tool was not available a long time ago. As far as I know, Retinas wasn't sold in Spain so I suspect that Spanish repairmen had to use ingenuity instead of the original Kodak tool and maybe they made their own tools; if this is the case, they have to be somewhere; this is a line that I would like to research.
While that, I'll try to figure out how to make my own tool, what approach is simplest and best.