I have one. I used some left over walnut tumbler media to fill it. The push button air release is very smooth. I inflated and slowly let the air out until it drops right on target. Quite happy with mine.
Could possibly make your own. You can buy air shims at Home Depot in the tool section. The...
My experiences where I live have shown me that where they are in the summer is different than where they are in October/November.
I’m learning to better predict with the help of mapping software.
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