When I got my kit they changed the aileron and flap horns from external to internal.
I contacted Anton as I was worried about flutter and he told me the internal horns work fine with no flutter reported.
I’ve got 8611’s on the ailerons and 8711’s on the flaps and there is no play but was wondering if anyone has heard of problems.
There doesn’ seem to be any hard points to mount external horns so I hope the present setup is OK.