Hello to all, I am new in this forum which I find very dynamic. I expose(explain) my problem: further to the installation of Feiyu Tech 3 axes "Ultra" I noticed vertical jerks from time to time especially on static shots. In movement the jerks disappear most of the time. The jerks are as small, brief but annoying shivers. Of what think of it you? Has anybody already had this kind(genre) of problem? Can it result(come) from too stiff dumpers?