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Just a heads up for the guys building their risers out of wood. I see lots of guys attaching them so that the grain of the wood runs parallel to the skis. Not saying it's right or wrong but attaching them so that the grain is running perpendicular is your best bet in that they will not break if your sled is ever on uneven ground. If you are attaching them so that the grain runs paralellel, you are greatly increasing your chances for them to break.
Cut back on the weight quite a bit over my wood versions by using PVC.
Yup... I'd remove all the pvc....