I need help resizing a welded part in only 1 direction

[NoobOfFlood_Nooby (Flood)]

Hello,
I want to resize Part A in one direction only, this part is welded to part B, so if u rotate that Part B, it will rotate Part A. I’m using a DragDetector that only rotates in 2 axis. And what I mean with resizing in only 1 direction, I mean like how the resize tool in studio works.

I’ve tried everything ive searched, like :Resize(), Resizing + changing CFrame but I still can’t find a solution. If I use :Resize(), strangley enough it resizes Part A in both directions, which i know it isnt suppose to happen, so its fustrating; If i use the CFrame method, it still resizes on both directions and messes with Part B’s CFrame

Edit: I do wanna mention that i do have these in a while loop that repeats very fast and that could be an issue since im testing this on a different place

Example of what happens when I use :Resize():

Example of what happens when I use the CFrame method:

I am using a Weld instead of a WeldConstraint because i wanted to use :Resize() but it doesnt work as i want it to.

Here’s the code of what i did for both

-- :Resize()
arrow:Resize(Enum.NormalId.Top, 0.75)

-- Resize + CFrame
local tween = TweenService:Create(arrow, TweenInfo.new(0.0075), {
					Size = arrow.Size + Vector3.new(0, 0.75, 0)	
				})
tween:Play()
arrow.CFrame = arrow.CFrame * CFrame.new(0, 0.375, 0)

I also tried to tween the CFrame but nothing would happen so i put it outside the tween, and im resizing and/or moving on the Y axis cause of how Part A is rotated.
I really would appreciate it if someone could help me with this because ive been stuck on this for few hours while sick lol

[Hzodx]

Whenever you change the size you need to also change the position by 1/2 the size change

[NoobOfFlood_Nooby (Flood)]

I already did that, 0.375 is half of 0.75

[Hzodx]

so that big size change is just 0.75 studs?

[NoobOfFlood_Nooby (Flood)]

its a loop that repeats a lot of times, thats why its that small

[NoobOfFlood_Nooby (Flood)]

So i ended up figuring it out how to fix it, so if anyone has a similar case, here’s a little guide with some information you might find useful in the future:

You cannot change the CFrame of a part that is connected to another part with either a Weld or a WeldConstraint with a tween, if you do it outside the tween, it will move the whole welded object togheter, which in my case i dont want it to.
With this in mind i figured out (i shouldve figured this out sooner) that you had to change the C0 or C1 of the Weld, so in my case its C1 because Part A is C1 of my weld. Unfortnunately I’m not sure how you can do this without needing 2 tweens if you want the whole thing to look smooth, but anyways here’s the code:

local tweenSize = TweenService:Create(part, TweenInfo.new(0.0075), {
		Size = part.Size + Vector3.new(0, 0.75, 0),
	})
local tweenCFrame = TweenService:Create(part.Weld, TweenInfo.new(0.0075), {
		C1 = part.Weld.C1 * CFrame.new(0, -0.375, 0) 
		-- You can try either positive or negative, i tried positive but didnt work how i wanted to so i decided to make it negative and it worked
	})
	tweenSize:Play()
	tweenCFrame:Play()

If you’re also doing this in a loop, you have to make the tweens in the loop because else it uses the original size and cframe so it only changes once.

Edit: also because the tween last’s that short, its kinda pointless doing it in a tween, so thats a fault on my part.