Help with tables?

Tool = script.Parent;
local arms = nil
local torso = nil
local welds = {}
local model = nil

function Equip(mouse)
	wait(0.01)
	arms = {Tool.Parent:FindFirstChild("Left Arm"), Tool.Parent:FindFirstChild("Right Arm")}
	torso = Tool.Parent:FindFirstChild("Torso")
	if arms ~= nil and torso ~= nil then
		local sh = {torso:FindFirstChild("Left Shoulder"), torso:FindFirstChild("Right Shoulder")}
		if sh ~= nil then
			local yes = true
			if yes then
				yes = false
				sh[1].Part1 = nil
				sh[2].Part1 = nil
				local torsoCF = torso.CFrame
				model = Instance.new("Model", workspace)
				local humanoid = Instance.new("Humanoid", model)
				local armcL = Tool.Parent:FindFirstChild("Left Arm"):Clone()
				armcR = Tool.Parent:FindFirstChild("Right Arm"):Clone()
				armcL.CanCollide = false
				armcR.CanCollide = false
				armcL.Parent = model
				armcL.Size = Vector3.new(1, 2.8, 1)
				armcR.Parent = model
				for i,v in pairs (Tool.Parent:GetChildren()) do
					if v:IsA("Shirt") then
						local shirt = v:Clone()
						shirt.Parent = model
					end
				end
				arms[1].Transparency = 1
				arms[2].Transparency = 1
				local farmLW = Instance.new("Weld", torso)
				farmLW.Part0 = torso
				farmLW.Part1 = armcL
				farmLW.C1 = CFrame.new(-0.4, 0.8, 0.6) * CFrame.fromEulerAnglesXYZ(math.rad(320), 0, math.rad(-90))
				local farmRW = Instance.new("Weld", torso)
				farmRW.Part0 = torso
				farmRW.Part1 = armcR
				farmRW.C1 = CFrame.new(-1, 0.5, 0.5) * CFrame.fromEulerAnglesXYZ(math.rad(-90), math.rad(-0), 0)
				weld1 = Instance.new("Weld")
				weld1.Part0 = torso
				weld1.Parent = torso
				weld1.Part1 = arms[1]
				weld1.C1 = CFrame.new(-0.4, 0.5, 0.8) * CFrame.fromEulerAnglesXYZ(math.rad(320), 0, math.rad(-90))
				welds[1] = weld1
				weld2 = Instance.new("Weld")
				weld2.Part0 = torso
				weld2.Parent = torso
				weld2.Part1 = arms[2]
				weld2.C1 = CFrame.new(-1, 0.5, 0.5) * CFrame.fromEulerAnglesXYZ(math.rad(-90), math.rad(-0), 0)
				welds[2] = weld2
			end
		else
			print("sh")
		end
	else
		print("arms")
	end
end

----------------------------[v The problem begins here v]-------------------------------
	
function Unequip(mouse)
	if arms ~= nil and torso ~= nil then
		local sh = {torso:FindFirstChild("Left Shoulder"), torso:FindFirstChild("Right Shoulder")}
		if sh ~= nil then
			local yes = true
			if yes then
				yes = false
				sh[1].Part1 = arms[1] -- This works
				sh[2].Part1 = arms[2] -- This works
				welds[1] = nil -- This is just one of my many attempts to fix this.
				welds[2] = nil --  Same here
				model:Destroy() -- not working
				arms[1].Transparency = 0 --This works
				arms[2].Transparency = 0 -- This works
			end
		else
			print("sh")
		end
	else
		print("arms")
	end
end
Tool.Equipped:connect(Equip)
Tool.Unequipped:connect(Unequip)

I am not exactly sure what is wrong here. Everything was working just fine. I hadn't made any changes to it until after.

I can't set the welds to nil and I can't call the :Destroy() method on model. There are no errors. It just doesn't work.

Any help would be appreciated since I have been trying to figure this out for two days now.