Dear forum, I like to teach myself how to repair accordions and hence have bought an old out of tune box only for the purpose of disassembling and assembling it back again. Currently I have removed all the reads and cleaned them. Now, before attaching new valves to them and waxing them back, I was wondering whether it makes sense to do some kind of pre-tuning? I have build a tuning bellows and some wooden blocks to make them sound, similar to the ones in this video. I know that their tuning will change when I install them back, but nevertheless, as they seem to be quite out of tune (+/- 15 cent sometimes even on the same reed when pushing or pulling) I was wondering whether it makes sense to pre-tune them now, so that I have to do later less filing while the valves and reed-block are in my way? My idea was to tune them all to approximately 0 cent now, install them back into the accordion and then do the further adjustments. Is this a valid approach, or do I have to expect the tuning changes after reinstalling them to be so large and unpredictable that all the filing I do now only means additional wear to the reeds but nothing I can benefit from during the later fine-tuning?