Give over , you knew it was bent, also some gunsmith your mate must be if there is such a person ( if he didn't know it was bent, or springs missing out the trigger, purely had the lads pants down, you should do the right thing & give the his cash back & put it down to experience, let him keep the 35 aswell as at least he has put a bit effort in to fix it,
That my opinion & that isn't going to change