I'm new to this addiction, only 4 years. My name is C**** and I have a flying problem. Not enough days off! I have prop balancer, it is the the top flight Mag balancer, I have checked new props with it taken them off put them back on and get a different heavy spot. Pluck a piece of hair from my head and set it on the prop, and now the low side reads heavy. Conclusion "Most composit/fiberglass/nylonglass props come balanced close enough from the factory". This isn't always true of wood props though. I would STRONGLY recommend a center of gravity balancer for the plane before the prop balancer. A truly out of balance prop will eventually damage the engine, but a unbalanced plane will crash in the hands of a beginer. As for the recoil tubing get rid of it and use silicone fule line, it is more flexible and can also be used to fix damaged fuel lines on the plane at the field. I tryed it when I first got into this "HOBBY/ADDICTION" it cracked and leaked and on cold days 35 deg.f snapped in the middle. These are only my oppions and experiences.