its normal the head gets hard or tough when you are performing the stretch, due to the extra presuere, like turnover mentioned.
ben when the [words=http://www.mattersofsize.com/forum/showthread.php?83577-Length-master-official-order-thread-now-shipping-06-16-2014!!!]
LM[/words] i attached and just dangel, then you head should not be hard, but when you are doing the stretch, yes.