my name is Manfred, iḿ from germany and bought a hardinge hlv. The machine seems to be okay but i,m wondering about some rattle noise of the variable speed drive. Left pic shows the machine form back. I tried tighten the motor belt with screw seen on middle pic but it was not successful. The pulley assembly (right pic) is vibrating and also the motor assembling plate while running. Any ideas to solve my problem?