How to change CFrame.Angles without making welded parts move with it?

I am trying to make a helicopter, that uses welded parts. When i want the blade to spin it moves the entire heli with it. Im using CFrame.Angles to move the blade. Heres the code:

local Heli = script.Parent
local Vseat = Heli.VehicleSeat
local Circle = Heli.Circle  
local InitalPos = Circle.Position    
local Spin = Heli.Spin    
      
while true do  
    if Vseat.Occupant then   
	    --Chopper Spin | This is the focus
	    local I = 170    
	    Spin.CFrame = Spin.CFrame * CFrame.Angles(0,I,0)    
	    I = I + 1
	        
	    if not Circle:FindFirstChild("Hover") then   
		    --Hover Effect    
		    local Hover = Instance.new("BodyPosition")    
		    Hover.Name = "Hover"    
		    Hover.MaxForce = Vector3.new(0,400000,0)    
		    Hover.Position = Circle.Position + Vector3.new(0,4,0)    
		    Hover.Parent = Circle    
		    end    
    end
    
    wait()
    
    if not Vseat.Occupant then    
	    if Circle:FindFirstChild("Hover")then
		    Circle.Hover:Destroy()   
		end
     end 
 end

The part you may be looking for is the code under "Chopper Spin"