I liked the part at 7:02 where he measured from the nut to the bridge for the exact bridge placement.  Too many violins are just set at the marks for the f holes. It is 328mm.

It is from the edge of the nut to the edge of the bridge.  This gives the string a lenght of 328mm to vibrate. At 328 the sinewave created by the string crosses the bridge at the point where the wave crosses the x axis. Harmonics is the word I was looking for.

Denny have you ever done your sound analysis on a Stradivari?

You are completely correct Terry.  Most strings are designed around this length and you can find strings where the playing length is stated on the string.

been gone for a few days, back for the afernoon only so here goes…

1- I did three seperate traces for strads that were done by pros playing various pieces. One from a web site, the others from youtube. Their traces are very distictively similiar.

2- I did a couple of different soundposts for my German violin but tried to maintain the largest dia possible which was about 6mm, the largest that would fit thru the ff hole. The previous dia was close to 4.5-4.75mm and I really didnt notice a lot of difference except the new one was better. It was placed better and was from a new dowel so maye just the fact it was new made the biggest difference.

3- I don't notice a lot of difference by listening but I have become acustomed to listening to the various tones that are veru indicitive of the desired trace. I actually "feel" the best tune up instead of hear it. The whole violin back seems to vibrate against my shoulder. The neck even vibrates much more as well and the sound seems to resonate even after the bow is removed vs. just stopping quick.

I was always taught to cut away from myself.  I ignored it often enough when I was younger and I have collected at least some of my scars that way.  Yeah, yeah, if you are being careful and all that.  But everyone has moments when the mind is elsewhere, and that is when safe habits can save you some blood. 

Everybody has the occasional dumb moments.  I know I sure do.  Just yesterday, we were going through some of the tools and implements we use for things like canning and freezing food here.  I was explaining to my daughter to please be really careful when washing the mandolin (the culinary slicing tool, not the musical instrument in this case) because we keep those blades very sharp.  Sure enough, I was holding the dang thing and not watching what I was doing and I sorta slid it and caught the outer edge of my right pinky finger on the blade.  

Nothing major, it was just a bit of blood and not a finger surface I use for violin or most other instruments.  Just slit the outer edge of the right pinky, but talk about feeling particularly dumb at that very moment.  It didn't need more than a band-aid and looked worse than it was, but still rather embarrassing when doing a "safety lecture".

I think most of the blades used in luthier type work are small enough that it would be unlikely to kill yourself or even do major harm with cutting towards yourself (I don't claim to know enough to be 100% sure on that), but getting blood stains off of bare wood is enough of an inconvenience to probably want to avoid it.