Draggable part, and keeping a certain rotation?

-- Written by RubenKan, edited by Scooterdip
local player = game.Players.LocalPlayer
local m = player:GetMouse()

m.Button1Down:connect(function()
    buttonUp = false
    if m.Target then
        if m.Target:FindFirstChild("AllowDrag") then
            if m.Target.AllowDrag.Value == true then
                local Job = player:FindFirstChild("Job")
				if Job then
					if Job.Value == "Baker" then
						if m.Target.Name == "Cake" then
							local Part = m.Target
                			m.TargetFilter = Part

                			repeat
								Part.Rotation = Vector3.new(-0, 0, 90)
                    			Part.CFrame = CFrame.new(m.Hit.p)
                    			wait()
                			until buttonUp
						end
					end
				end
            end
        end
    end
end)

m.Button1Up:connect(function()
    buttonUp = true
    m.TargetFilter = nil
end)

Hey. This script is put in the StarterPlayer scripts, and it makes certain parts draggable. I was wondering if there was a way to keep the Rotation at a certain angle, because

Part.Rotation = Vector3.new(-0, 0, 90)

doesn't do it. Thanks in advance.