I saw this thread this morning and this is what I came up with to take up the extra 'slack' in the mechanism. I only took off the powervalve cover, and didn't fool with taking the transmission cover off.
I made this from a small spring I got for $.50 at the local hardware store. I cut a small notch into the powervalve shaft with a Dremel. I then looped the end of the spring around the allen bolt. The spring tension itself is very light and only keeps the shaft from flapping around. Hopefully it won't delay the valve opening by much if at all.
I will report back in a few hours after a test run.
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'10 EC300 -- very happy
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