A few times in the past, with other guns, I've had a pile of parts on the bench that I couldn't figure out how to get back into the gun because they fell out not knowing how they were oriented originally.
Same thing above happened also but it literally needed a jig to get back together so I had to ship it off, or if lucky, at minimum, took two people/four hands to get things back together again.
Then at other times it could take hours and hours deducing how I went wrong as well as hours of trial and error, that is if I didn't damage or lose a part or parts.
For example the Delrin washer between the fill valve and the part it screws into. I didn't see it fall out so no idea where it went???
Yes I'm paranoid, lol. I think I've been emotionally tortured trying to mod or fix guns, is why, LOL. OH crap here I am again, why can't I leave well enough alone, lol!
I'll say this, I'm better at this stuff than when I was younger and have learned the hard way about a lot of things!!! Pain is a good teacher.