How do I put and weld a part to a sword?

i tried to make it so that when I press q my sword glows and gets longer so what I did is I made a separate part and made a script that teleports it to the sword’s cframe then weld it. The problem is it doesn’t work. Can you guys check what’s wrong with my script? or what I can do to make my sword look longer and glow?

here’s a video of how it doesnt work and at the end how I wanted it to look like:

local script:

local character = game.Players.LocalPlayer.Character
local rp = game:GetService("ReplicatedStorage")
local excalibureffect = rp:WaitForChild("ExcaliburEffect"):Clone()
local excalibur = character:WaitForChild("excalibur")
local uis = game:GetService("UserInputService")
local debounce = false

	if isTyping then 
	elseif input.KeyCode == Enum.KeyCode.Q then
		if debounce == false then
			debounce = true 

			excalibureffect.Parent = game.Workspace
			excalibureffect.CFrame = excalibureffect.CFrame *
			local weld ="ManualWeld")
			weld.Part0 = excalibureffect
			weld.Part1 = excalibur
			weld.C0 = weld.Part0.CFrame:ToObjectSpace(weld.Part1.CFrame)

Try to put this in “Scripting Support” that’s where people can help you find your answer, by the moment you are asking for help in the “Art and design Support” that has nothing to do with scripting. Hope this helps you out to find your answer.

Thanks for telling me that, sorry for posting it here I thought it wouldve been counted as a gfx type of problem.