Any weight will work, it depends on how it will be used and / or personal preference.
Try to make the bottom completely flat like this: Unsecure image, only https images allowed: http://www.wildhorizons.com.au/images/stories/highlands-trails/mcleod01.jpg Mine has bolts on the bottom and they get in the way of packing a perfectly smooth surface: Unsecure image, only https images allowed: http://i.ebayimg.com/images/i/140818037291-0-1/s-l1000.jpg
It looks like the circle is a little bit off center. I would recommend centering the circle from flat edge to the start of the teeth, instead of the end of the teeth It might feel more balanced in your hand that way
It looks like the circle is a little bit off center. I would recommend centering the circle from flat edge to the start of the teeth, instead of the end of the teeth It might feel more balanced in your hand that way
The circle is perfectly placed in the center of the rough square. Next time I'll consider your tip