Basically when I put the blades on I trim/dremel the blade while it is assembled to the d/shaft. I trim/dremel it until the suspension has full travel.
As there is quite a lot of compounding of tolerances when the car's are put together, no two cars are completely the same, so you have to trim the blade to suit your car.
The 0.5mm in the instructions is a guide to how much you need to remove.
As the 61333 blade is designed really for use in TC you have to modify it.
Done right, my blades lasted from Stotfold National to York Indoor regional.
A little time spent on getting the blade done spot on when you build them is well worth the effort.
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5 Time Oople Invernational SC Champion.
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