[Raycasting] How to change center of CFramed object?

Please read title, it explains everything I'm trying to accomplish.

My problem is that I want the beam to be centered on its edge but not on its actual center, help!

game:GetService("RunService").RenderStepped:Connect(function()
local beam = game.workspace:WaitForChild("TargetDirection")
beam.Name = 'TargetDirection'
beam.CanCollide = false     
local Target = game.Workspace:FindFirstChild("Lock On!")
local HumanoidRootPart = game.Players.LocalPlayer.Character:WaitForChild("HumanoidRootPart")
local ray = Ray.new(Target.CFrame.p, (HumanoidRootPart.CFrame.p - Target.Position).unit)
local AnchorPoint = script:WaitForChild("AnchorPoint") 
if (Target.Position - HumanoidRootPart.Position).magnitude < 20 then
    beam.BrickColor = BrickColor.new("Lime green")
        beam.FormFactor = "Custom"
        beam.Material = "Neon"
        beam.Transparency = 0
        beam.Anchored = true
        beam.Locked = true
        beam.CanCollide = false 
        beam.Shape = Enum.PartType.Cylinder
        beam.CFrame = CFrame.new(ray.Origin, ray.Origin + ray.Direction)* CFrame.Angles(0,math.pi/2,0);
        beam.Size = Vector3.new(((Target.Position - HumanoidRootPart.Position) + AnchorPoint.Value).magnitude, 0.05, 0.05);
else
        beam.Transparency = 1

end
end)