bought 3 sets of thes new big bore 50mm qutus dampers.
1 set was ok.
1 set was the bottom of cilinder machined wrong (lock holes missing)
1 set had the damper rods 52 mm (5pc) en 50 mm 3 pc) so incomplete for building 50mm set.
Just try to claim them and waiting for response of RC Mart now.
Build quality of 1 set looks great and functions well, but quality control of yeah racing is completely lacking.