Findings so far on the right angle drill accessory: #Brico: €50, #Clabots: €30 (backroom), small local hole-in-the-wall: €20. Looking for cheaper yet. Surely there must be more holes in the wall that would have this cheaply.
Failed in #Brussels again to find plumbing supplies. Not even #Clabots has a swaging tool for copper pipe, despite half a dozen different tools being on the market that do it → https://yewtu.be/watch?v=uPNtqJabTI4