I loosen the bolt all the way and let it swing on it's own. Occasionally I move the scrapper towards the center by hand to let the dough extrude through the gap. FYI, The bolt does NOT lock the arm towards the rim. It ONLY locks the arm so towards the center (keeps it away from the rim). It can always swing in towards the center no matter how tight the bolt is. This took me a while to realize this.
Anyway, if you find that the arm is swinging towards the center it's probably because the dough is sticking to the roller and then it's just spinning kind of uselessly. If this is happening to you, read my web page again about how to mix. If you are experiencing this, especially with such a small batch, it's because you are adding too much flour at the beginning, when you really should let most of the mixing occur before adding the last amount of flour. Also, pay attention to the autolyse periods, which are THE real key to making smooth dough. Get to my page by clicking the globe under my name.