The point is, imagine how precise you have to be to make any spare when you are throwing with plastic at double wood. Throw in the fact that the person is usually throwing it faster, adding more deflection, and it just makes no sense to throw straight at it.
This seems like a never ending argument among people over whether to throw plastic at double wood or not. To me, it is just completely illogical to force yourself to be that accurate at a spare. And don't come at me with "wait till you get on tough conditions," i bowl in a sport league with changing conditions every week, i bowl in multiple centers, and I think that there is no way that you will ever have as much area to miss with plastic as you do with moving off of your hook line. I have seen too many people, thinking they were more accurate than they are, throw at the bucket with plastic and leave the back pin because they just barely miss or chop it with plastic (because you still can chop it). The same goes for the 3-6-9-10, you have to honestly be so blinded by whoever is coaching you to do this or are not using any common sense when thinking about throwing plastic at double wood. I don't care how accurate you are, you can be just as accurate with a hook ball, make an adjustment off your strike line, and have much more margin for error.
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stanski