how to make a part spin for the shuriken?

upon pressing b my parts spawn however the part won't spin how can i make it do this ?

uis.InputBegan:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.B then
        block = not block
        local hrp = game.Players.LocalPlayer.Character.HumanoidRootPart
        local parts = {}
        local numberofparts = 4

        for i = 1, numberofparts do
            table.insert(parts, game.ReplicatedStorage.nail:Clone())
        end

        for i, part in pairs(parts) do
            part.Anchored = false
            part.CanCollide = true
            part.Parent = workspace
        end
        local fullcircle = 2 * math.pi
        local radius = 10
        local function GetXandZ(angle) 
            local x = math.cos(angle) * radius
            local Z = math.sin(angle) * radius
            return x,Z
        end 
        game:GetService("RunService").Heartbeat:Connect(function()
            if block == true then 
                for i,part in pairs(parts) do 
                    local angle = i *(fullcircle/#parts)
                    local x,Z = GetXandZ(angle)

                    local position = hrp.CFrame*CFrame.new(x,0,Z).Position
                    local Lookat = hrp.Position

                    part.CFrame = CFrame.new(position,Lookat))
                end
            elseif block == false then
                for i,part in pairs(parts) do
                    part:destroy()
                end
            end 
        end)


    end
end)

thanks in advance