How to move model without deleting attachments?

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Tables = ReplicatedStorage:FindFirstChild("Tables")
local Servers = ReplicatedStorage:FindFirstChild("Servers")
local Table = Tables:FindFirstChild("Table")
local model = Servers:FindFirstChild("LowBudgetServer")
local PlaceTableButton = script.Parent.StructureFrame.PlaceTable

local function PlaceTable()
	local tableClone = Table:Clone()
	tableClone.Parent = workspace
	tableClone.Button.ClickDetector.MouseClick:connect(function()
		local modelClone = model:Clone()
		modelClone.Parent = workspace
		local weld = Instance.new("WeldConstraint")
		weld.Parent = tableClone
		weld.Part0 = modelClone.PrimaryPart.Attachment
		weld.Part1 = tableClone.Button.Attachment
	end)
end

PlaceTableButton.Activated:connect(function()
	PlaceTable()
end)

That's my script and the problem is, it does all it has to do except for one thing. It can't move the model to the position (in this case the position I want it to be on is the top of the table). How do I do it with my attachments?