How do I get Instance.new("Attachment") to connect a beam?

I'm trying to make it so that when I click on the basicGrave it creates a new attachment with Part1 as the parent and updates my Beam in game.StarterPack.starterTool.Handle's attachment0. The script I have below creates the attachment, assigns its location/parent, and updates the Beam but produces no beam effect. If I do this manually without the script then it works just fine.

script.Parent:WaitForChild("ClickDetector").MouseClick:Connect(function(plr)
    if script.Parent.Name == "basicGrave" then
        if plr:FindFirstChild("leaderstats") then
            local vacuumBeam = Instance.new("Attachment")
            vacuumBeam.Parent = script.Parent.Part1
            vacuumBeam.Position = Vector3.new(vacuumBeam.Parent.Position.X,vacuumBeam.Parent.Position.Y,vacuumBeam.Parent.Position.Z)
            game.StarterPack.starterTool.Handle.Beam.Attachment0 = vacuumBeam
        end
    end
end)