Hello sorry for my english im from eastern europe,I have this problem with my trasmission 600 sec, it starts in 1st shifts to 3rd, basicly no 2nd gear or slipping. And i tried everything, and i know the brake band b1 is OK, my mechanic probably put the self adsjusting piston in whatever way in. I suppose it was not the right way, but he was so sure so I didnt think about it until I mess with the valvebody to be sure, now after I did mess with the valvebody and the control valves to check operation ,the problem is still there so I need to move to the piston again and this time I need to be sure to do it right please explain me how to do it cause im not getting it from your description.

help would be much appreciated thank you.