I have a Cuisinart stick-blender, but it's a different model that does not have a locking button (thankfully!). I just plug it in and hold down either 'Low' or 'High' to make it go, and when I want it to stop, I just release the button. I had never seen the kind with the locking mechanism until your post, so after reading your post and also Scooter's post, I did a search and found it. It looks like it's the cordless type- model CSB-300?
Anyway, I read through the online manual for it to see how to use it, and you are understanding perfectly how it works,
and you have every right to be annoyed! It says that if you want to pulse (which is something every soap-maker
needs to be able to do), you actually have to constantly hold down the lock/unlock button
at the very same time you are pressing & releasing the on/off button. Seriously? How impracticable is that? It sounds like the kind of stick-blender that belongs on the Island of Misfit Toys! If it were mine and I hadn't yet destroyed it by throwing it against the wall in frustration, I would return it pronto because there's no way on earth I would ever want to use it.
IrishLass