Since that's an aftermarket spinner, it might have been replaced as an assembly - spinner, spinner bracket and posts. The geometry of the spinner assembly doesn't look right - spinner bracket is bent upward. It seems like the center line of the spinner is too low. It might be that the spinner bracket is the wrong size or the posts holding the spinner bracket are too short. An easy fix to make the spinner bracket higher would be to add some small washers to the top of the posts.

If the weight of an aftermarket spinner is different than the weight of the original spinner, then there could be problems with the spinner leaning forward or backwards. Incorrect height of the spinner can also affect the spinner's resting angle.

The original metal spinner was yellow with exploding bowling pins on the front side and a black bowling ball on the back side.