I Need Help With Pivoting Rotating Parts

Help and Feedback Scripting Support
#1

I made a script that closes and opens 8 parts by a 180 degree but need help with pivoting it somehow so it rotates from the end of the part instead of just going back and forth from the origin point, I am struggling with figuring out on how I can achieve this

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local rotAngle = 45
local rs = game:GetService("RunService")
for i, part in pairs(script.Parent:GetChildren()) do
	local angle = 360/8
	if part:IsA("BasePart") then
		part.CFrame = workspace.Origin.CFrame * CFrame.Angles(math.rad(angle*i),0,math.rad(45)) * CFrame.new(0,15,0) 
	end
end

rs.Heartbeat:Connect(function()
	if rotAngle == 180 then
		rotAngle = 0
	end
	rotAngle+=1
	for i, part in pairs(script.Parent:GetChildren()) do
		local angle = 360/8
		if part:IsA("BasePart") then
			part.CFrame = workspace.Origin.CFrame * CFrame.Angles(math.rad(angle*i),0,math.rad(rotAngle)) * CFrame.new(0,10,0)
		end
	end
end)