Vta dial tower on Aries 1

Vta dial tower will not go up or down there are 2 set screws one on the side one on the top I taken the top off which is the dial with numbers on it there's a meter shaft coming up  I don't think screws are stripped called vpi  want me to send pictures ,I guess he doesn't have any?  I been looking at some tt the only difference I see is the side screw has knob screw now, looks like same tower can anyone help me to fix it thanks