cant change the parts position in the tool

[static solstice]

i made a sword with a blade that grows every time i hit a player, but when it grows i need the position to go higher to fit it on the handle, but when i use CFrame, it doesn't move at all, when i use Position, it moves but then it looks like what i put in the image.
how do i fix this?

the code im using

local Katana = script.Parent
local blade = Katana.blade

local swingAnimation1 = Katana.swinganimation

activated = false
touchcooldown = false
activatedcooldowntime = 0.25
local touchedplayers = {}
blade.Touched:Connect(function(hit)
    if activated == true and hit.Parent:FindFirstChild("Humanoid") then
        local myplayer = game:GetService("Players"):GetPlayerFromCharacter(Katana.Parent)
        local myhumanoid = myplayer:FindFirstChild("Humanoid")
        local mycharacter = myplayer.Character or myplayer.CharacterAdded:Wait()
        local myHumanoidRootPart = mycharacter:FindFirstChild("HumanoidRootPart")
        local humanoid = hit.Parent:FindFirstChild("Humanoid")
        local character = humanoid.Parent
        local player = game:GetService("Players"):GetPlayerFromCharacter(character)
        if humanoid.Parent ~= Katana.Parent then
            if player and touchedplayers[player] then
                -- (uneeded code)
            elseif touchcooldown == false then
                local damage = math.random(1,100)
                print(damage)
                touchcooldown = true
                humanoid.Health -= damage
                blade.Size += Vector3.new(0, 0.5, 0)
                                --blade.CFrame += CFrame.new(0, 0.25, 0)
                blade.Position += Vector3.new(0, 0.25, 0)
                task.wait(activatedcooldowntime)
                touchcooldown = false
            end
        end
    end
end
end)```

[stiff path]

you need to add to the position in objectspace not worldspace. blade.Position += Vector3.new(anything) is worldspace. what this means is the blade will slowly drift away from where it should be if this happens while it is moving and is not perfectly aligned to the world grid.

simplest way for you is probably blade.position += blade.cframe.upvector * distance

[static solstice]

thank you SO much, it works and i learned something new.