Help with a building system (resize tool)

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1

i have a system i made that will resize parts using Handle adornments and it seems to work but increment system doesnt work and also it scales on both sides and i dont want that happening


local inc = 1
local handles = script.Parent:WaitForChild("Resize")

local function GetIncrementMultiple(Number, Increment)
	local MultipleDifference = Number % Increment
	local LowerMultiple = Number - MultipleDifference
	local UpperMultiple = Number - MultipleDifference + Increment
	local LowerMultipleProximity = math.abs(Number - LowerMultiple)
	local UpperMultipleProximity = math.abs(Number - UpperMultiple)
	if LowerMultipleProximity <= UpperMultipleProximity then
		Number = LowerMultiple
	else
		Number = UpperMultiple
	end
	return Number
end
local AxisSizeMultipliers = {
	[Enum.NormalId.Top] = Vector3.new(0, 1, 0);
	[Enum.NormalId.Bottom] = Vector3.new(0, 1, 0);
	[Enum.NormalId.Front] = Vector3.new(0, 0, 1);
	[Enum.NormalId.Back] = Vector3.new(0, 0, 1);
	[Enum.NormalId.Left] = Vector3.new(1, 0, 0);
	[Enum.NormalId.Right] = Vector3.new(1, 0, 0);
};
function MouseDrag(side, distance)
	local part = handles.Adornee
	if part == nil then return end
	print(distance)
	if side == Enum.NormalId.Right then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector = dist * AxisSizeMultiplier;
		part.Size += incvector
	end
	if side == Enum.NormalId.Left then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector =  dist * AxisSizeMultiplier;
		part.Size += incvector
	end
	if side == Enum.NormalId.Top then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector =  dist * AxisSizeMultiplier;
		part.Size += incvector
	end
	if side == Enum.NormalId.Bottom then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector =  dist * AxisSizeMultiplier;
		part.Size += incvector
	end
	if side == Enum.NormalId.Front then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector =  dist * AxisSizeMultiplier;
		part.Size += incvector
	end
	if side == Enum.NormalId.Back then
		local dist = GetIncrementMultiple(distance,inc)
		local AxisSizeMultiplier = AxisSizeMultipliers[side];
		local incvector =  dist * AxisSizeMultiplier;
		part.Size += incvector
	end
end
handles.MouseDrag:connect(MouseDrag)

here is the code
cant send game file cuz i dont know why and its not getting uploaded