"TexureID is not a valid member of MeshPart. Blade2 is not a valid member of model" (but they are)?

So I've got a script that is supposed to change the TextureID and material of a Part that is in the player when a tool is equipped, but it just gives me the errors in the title of the question. If I add a wait(2), it works, but I can't afford to make it wait to change the part. The part is put into the character with a script when the player equips a tool.

Here's the script that inserts the part:

script.Parent.OtherSwordOn.OnServerEvent:Connect(function(Player)
    if Player.Character:FindFirstChild("Blade2") == nil then
    local RArmWeld = Instance.new("Weld")
    local Box = script.Parent.Parent.Handle:Clone()
    RArmWeld.Parent = Box
    RArmWeld.Part0 = RArmWeld.Parent
    RArmWeld.Part1 = Player.Character.LeftHand
    RArmWeld.C1 = CFrame.new(0, -0.12, -2.5) *CFrame.Angles(0, math.rad(180),math.rad(90))
    Box.Name = "Blade2"
    Box.CanCollide = false 
    Box.Parent = Player.Character
    elseif Player.Character:FindFirstChild("Blade2") ~= nil then
        Player.Character.Blade2:Destroy()
    end
end)

This script works fine for some reason. ^

These next 2 scripts give the errors. I've tried changing them to :FindFirstChild(), but then the script simply doesn't work

script.Parent.Out.OnServerEvent:Connect(function(Player)
    if Player.NonStats.BusoOn.Value == true then
        local Stick = script.Parent.Parent
        Stick.Handle.TextureID = ""
        Stick.Handle.BrickColor = BrickColor.new("Institutional white")
        Stick.Handle.Material = "Neon"
        Player.Character.Blade2.TextureID = ""
        Player.Character.Blade2.BrickColor = BrickColor.new("Institutional white")
        Player.Character.Blade2.Material = "Neon"
        Player.Character.UpperTorso.Buso:Play()
        wait(0.5)
        local P1 = game.ReplicatedStorage["Buso For Sout oWo"].Steam:Clone()
        P1.Parent = Stick.Handle
        local P2 = game.ReplicatedStorage["Buso For Sout oWo"].Steam:Clone()
        P2.Parent = Player.Character.Blade2
        Stick.Handle.BrickColor = BrickColor.new("Really black")
        Stick.Handle.Material = "SmoothPlastic"
        Stick.Handle.Reflectance = 0.1
        Player.Character.Blade2.BrickColor = BrickColor.new("Really black")
        Player.Character.Blade2.Material = "SmoothPlastic"
        Player.Character.Blade2.Reflectance = 0.1
        game:GetService("Debris"):AddItem(P1, 1)
        game:GetService("Debris"):AddItem(P2, 1)
        wait(0.5)
        if Player.NonStats.BusoOn.Value == false then
        Stick.Handle.TextureID = game.ReplicatedStorage.Swords["Dual Katanas"].Handle.TextureId
        Stick.Handle.BrickColor = BrickColor.new("Burnt Sienna")
        Stick.Handle.Material = "Slate"
        Stick.Handle.Reflectance = 0
        Player.Character.Blade2.TextureID = game.ReplicatedStorage.Swords["Dual Katanas"].Handle.TextureId  
        end
    end
end)

script.Parent.OutOff.OnServerEvent:Connect(function(Player)
    if Player.NonStats.BusoOn.Value == false then   
    local Stick = script.Parent.Parent
    Stick.Handle.TextureID = game.ReplicatedStorage.Swords["Dual Katanas"].Handle.TextureId
    Player.Character.Blade2.TextureID = game.ReplicatedStorage.Swords["Dual Katanas"].Handle.TextureId
    end
end)

Thanks for reading! I really need some help with this because it's delaying a feature x.x