Here for sale is a full set of 600-700 size heli servos.
2x align ds 820m
1x align ds 820
1x align ds 825m

All servos in great working order removed from my kraken 580.
I used the ds 820 on the elevator personally just to keep the same 820m’s up front (cyclic and pitch). 820 and 820m are same , the only change is metal gearing I’m led to believe. Again worked flawlessly on my heli.