How to make something stay on your body part and move with it?

I am making a script which charges a red orb on the end of your outstretched arm, how would i make it stay with the arms movements?

game.ReplicatedStorage.Custom.OnServerEvent:Connect(function(plr,mousehit,key)
	if key == "Blast" then
		local char = game.Players[plr.Name].Character
		local hum = char.Humanoid
        local root = char.HumanoidRootPart
        local charging = Instance.new("Part",workspace)
        charging.Shape = Enum.PartType.Ball
        charging.Material = Enum.Material.Neon
        charging.Size = Vector3.new(0.1,0.1,0.1)
        charging.BrickColor = BrickColor.new("Really red")
        charging.CanCollide = false
        charging.Anchored = true
		charging.CFrame = char["Right Arm"].CFrame (--SymbolHere) ???????
	end
end)

Also, when the animation plays, it will go back to a regular position after a few seconds, which shouldn't happen.

local weld = Instance.new(“Weld”, RightHandOrWhateverThePartIs)
weld.Part0 = RightHandOrWhateverThePartIs
weld.Part1 = OrbThatCharges
weld.C0 = RightHandOrWhateverThePartIs.CFrame:inverse()
weld.C1 = righthandorwhateverthepartis.CFrame * CFrame.new (0,0,0)—this will be how far the orb is from your right hand or whatever the part is 

when the animation is done delete the weld idk if this is 100% correct look up some tutorials i made this off the top of my noggin.