I've also found that I have to press the button down all the way for mine to activate. It's not hard to press, however. I rather like mine that way, as it makes it easier to carry in my suit jacket pocket and not have to worry about accidental activation. It seems that every couple of days I'm having to use a toothpick to apply the noalox for optimum firing, but I'm okay with that.
I can't stay long, since I've had to drag myself off of my sickbed (stomach flu) to post this, but my package from eastmall with some reg voltage 510, 901 and 801 attys are on the way and is entering customs. I've never tried the 801s before, but the 901 from my wife's dse905 works great on my xhaler? What is anyone's experience using these attys on their unit.
I lucked out on my #7 model purchase from lawnman3, really like how this sucker looks, and love how it works.