no? just coz it freaks people out does not necessarily make it bad! But now watch out! We'll get a slap on the wrist soon from the moderators for being off topic. Better include something constructive here...
For a good star test you need high magnification; maybe as high or higher than your scope can normally use (much higher than you get with a 15mm EP). Then you'll see diffraction ring(s) around in-focus images of stars. You might need an artificial star because the atmosphere will probably be too noisy.
I don't think there's a need to lock the adjustment screws on the finder. It tends to be pretty good at holding its position. Plus the spring loaded screws make it so easy to adjust.