EEeek..I somehow just knew that someone would ask this..seeing as how I was fiddling around..I got those skiis done..and back to the owners..I just tested 'em/wrote the info/down.From memory.
Ski 1 I remember had Salomon.997
Ski 2 had older Salomon. ...plastic
Ski 3 had old metal Salomon...OLD..
Ski 4 had metal Tyrolia's..I'm not really a Tyrolia man so I'ld only be guessing at their age.
When I dropped these off I picked up a pair of skiis with Salomon 957 C.These tested the same as the first ski 1..this didn't surprise me.
I also was given a pair of Rossi 9S with Tyrolia 790..these I will just drop off at a charity today..but I did test them too!..40 to 90..7/16" travel.
There was also a pair of later Markers in a box to be mounted..I didn't really look at them.Maybe I'll test them/post when I do them.
And a pair of ANCIENT Salomon 747 metal "E".s..that are gonna go on a mono setup.Ditto.
Personally..I think that any binding during testing that exhibits weak forward spring pressure..should be rejected.And I have done it..are they unsafe?Depends..I have told people of this..and they've said they never had problems.Some rental bindings..it simply amazes me how they stay on.
It does affect the release value to a very small extent..not really noticeable.
It can have a noticebale effect on the release value if the heel is adjusted too far forward..and the boot is jammed in.
Bindings with a large screw to control the forward pressure..have been notoriously cranked up with a huge screwdriver..AFTER the boot is in the binding.This can/has led to coil bind..and NO release.
I think phantoms are caused by the heelpiece jamming in it's own track..either caused by ice/snow/road grit..not greased..OFTEN without adequate spring travel to begin with(junk/worn track)Some bindings you simply cannot take the heelpiece of it's track..to clean/lube..Others..slide easy..on/off.OR
by the flex of the ski/lifting of the boot heel to one side/torsional twist.This doesn't allow the spring pressure to force the heelpiece forward.
Dampning in this area started..a LONG time ago..some bindings had dual springs here.
I don't think that any use would not allow the spring to maintain heelpiece contact..UNLESS the binding was not jamming in it's own track.
It has been said that at extreme speeds..on a rough course can cause the heel of the boot..to bounce up and down to the point where it is vibrating..the heelpiece moving back and forth rapidly under spring pressure.ADD the flex of the ski to this..maybe some torsional twist of the ski/twisting the binding track,junk in the track..out ya come..