This sounds normal. The props just mount with the six screws. Then you have the shaft with the hole in it for your spinner screw.
For reference the center shaft on my DA 100 sticks out about 1-1/4" from the hub. I'm using a Menz 28x10 prop and the shaft sticks out enough to just go through the prop washer. I believe your Mejzlik prop has a thicker hub than my Menz.

Jim