Brian: No, this was the first I had ever seen these. I was going to build my own version of the same thing. I bumped up to a 3/8 diameter sized one, with 5-10 lbs of push on it. I have nothing to judge that by, but it seems a good starting point. Plus, combined with the internal one in the 350. it should be ok, I hope.

That's what is great about these forums, there is such a large pool of info and experience to draw from.

Don