Sorry mate I have no experience with Prakticas It sounds pretty bad to me :( My experiences of repairs are that they cost the earth and replacements always a better option. I would cost the repair and the replacement and go from there. I often get asked if I am interested in seconhand stuff through my club or at work do you want me to keep an eye out for you? :O)

Those who do not want to imitate anything, produce nothing. Salvador Dali