The bar is in my opinion long enough and the threads also ok. Between Tubeaufsatz and staff there were no gaps that would push through to the irritation can result. The Tube is actually great as well. Wide enough and with enough margin for pulsating earlobe.
Vaseline is anyway a must and so everything goes great. I got the bar each for both ears in use had (got the tube after 3 days on a conventional changed and thus again been free for the other ear). I just only stretch my ears and this is only once per page and size of needs in the optimal case, yes ... I find the plastic variant perfectly adequate and need not here stainless steel etc.