  We introduce feedback-measurement technologies to achieve flexible control of
Weyl points and conduct the first experimental demonstration of Weyl type I-II
transition in mechanical systems. We demonstrate that non-Hermiticity can
expand the Fermi arc surface states from connecting Weyl points to Weyl rings,
and lead to a localization transition of edge states influenced by the
interplay between band topology and the non-Hermitian skin effect. Our findings
offer valuable insights into the design and manipulation of Weyl points in
mechanical systems, providing a promising avenue for manipulating topological
modes in non-Hermitian systems.
