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So.....hours coming up with a template of this "tool" and the follow on prototype made out of fossilized whale bone which, in turn, is scanned into a 3D printer to render the final tool to depress the valve spring ??? All you have to do is take 2 minutes to remove 4 or 5 bolts holding down the rocker arm assembly and bingo......the whole damn thing is out of the way and you can start feeding the rope! You could also borrow a compressor and skip the rope all together (pun intended). Napa has a couple different types of spring compressors for little money too. One last suggestion, cover everything up before starting to remove the valve spring. Those little valve stem keepers have a habit of disappearing if you don't handle them with a magnet.

Tim