old bindings on new skis?

Question
We have two pairs of old (80th) skis and not much money.  I just got a great deal on a pair of skis for my 10 year old and am wondering if I can remount my old bindings on his brand new skis.  The skis are Blizzard Junior 6.5 Freeride ski. The bindings areSolomon 347 or I also have a pair of Look XF (?).  My son fits into my skiboots that I used with the old skis with the Look bindings - will that work or do I have to get him Junior boots (they seem to be shorter on the bottom and I am not sure what the difference would be)
If these bindings won't work, how about I buy some beat up skis at Play it again sports and remount those bindings on the new skis I bought?
Thanks for any help you can be! Carola in MI

Answer
My advice is that you will probably need to replace the bindings for the following reasons:

1) The Salomon 347 and Look XF (?) do not appear to be on the current NSSRA indemnification chart of bindings still considered to be serviceable. How old are the bindings and how many days of use do you estimate they will have had? Simply put bindings have a kind of shelf life because of the exposure to the elements (and in particular corrosion from travel as a result of road salt, etc.) that render them technically inaccurate (the DIN setting may or may not represent the amount of force necessary for the boot to release from or be retained in the binding. Since release and retention are the functions of the binding that we are concerned with here safety might be a concern. The only way to be sure is to have the bindings tested accurately in a shop that has the equipment capability to do this.

2)One of the differences between adult boots and junior boots is in terms of the boot/binding interface (the part of the sole that come into direct contact with the binding). The dimensions are quite different. Many modern junior bindings allow the binding technician to set up the binding for either sole standard but some early models do not. How much does he weigh? This could also be a concern in order to set the binding appropriately for his protection if he is too light for an adult binding.
3) There is generally no problem with having a shop that is certified in the mounting procedures for the binding that you purchase to remount bindings from one pair of skis to another as long as the pair of skis that they are being mounted to has been drilled minimally in the past. The only concern is when the holes from the new pattern are too close to the old or existing screw holes. there needs to be a minimum of one full width of a screw hole of undrilled material between every screw and an existing hole (so that there is no chance of overlap) and this old hole needs to be plugged with a firm material such as a plastic binding hole plug.

To summarize: If the skis that you bought are new and you buy a recent set of bindings (in the appropriate type for the skier) even if they are already on an existing set of skis there should be no problem having a shop mount these (on the condition that they have the correct jigs for the binding and are certified in the process by the binding manufacturer).

Hope this helped.
Glenn