Spinning a GUI like a Pendulum?

(my first post)

I've been trying to make a image label spin like in that FNF Hypno's Lullaby mod, but when i try to do it, it looks hella ugly. Is there any way around this or making this not have this ugly tweening

function movePendelum()	
	task.spawn(function()
		while true do
			local speed = script:GetAttribute("speed")
			task.wait(speed/2)
            TweenService:Create(Pendelum, TweenInfo.new(speed/2, Enum.EasingStyle.Circular, Enum.EasingDirection.InOut, 0, false, 0), {Position = UDim2.new(0.5, -118,0, -34),Rotation = 45}):Play()
     		task.wait(speed/2)
		    TweenService:Create(Pendelum, TweenInfo.new(speed/2, Enum.EasingStyle.Circular, Enum.EasingDirection.InOut, 0, false, 0), {Position = UDim2.new(0.5, 118,0, -34),Rotation = -45}):Play()
		end
	end)
end

video examples: https://vimeo.com/657963307 https://vimeo.com/657964424

simply change the rotation of the pendulum (would have to do some configuring especially if you don't want the whole pendulum to move aka it won't look like it's being swung but just a literal moving picture)