"There's nothing wrong with the metal Tyrolia 490's".
Well..actually not true.Sorry..no offense.. but I gotta go with what others have said so far.
I know a lot about old bindings.For ALMOST ALL skiers,techs, and shops..there is A LOT! wrong with them.VERY.. MOST IMPORTANTLLY!! is that they are old..AND the knowledge,expertise to PROPERLY maintain them,set them up is going fast.For this reason ALONE is enough..OR should be that..they ARE NOT! used OR serviced by the VAST majority(almost all) of skiers or shops..HENCE the indemnity of certain bindings.WHO? wants to USE..let alone ski in a SAFETY device(binding)..that there is LITTLE service information..OR the personnel with the tools,knowledge or expertise to deal with..PLUS the industry as a whole has LOST confidence in.
This being said there are EXTREMELY rare cases where..you are right..that "there is nothing wrong with the metal Tyrolia 490's".OBVIOUSLLY they were good..in their day.BUT! what about today?..PERSONALLY!..I HATE! with a passion to see people getting into trouble..HURT.. because of a VERY easily corrected situation..just that your reply seemed a little defensive.IF these were NEW! OR METICULOUSLLY maintained by an expert..OR recentlly tested by such..THEN this would be an entirely different story.
I trust ski bindings with my life.Not long ago someone contacted me looking for a pair of these..Tyrolia 490 RD's(14 din).They wanted NEW! ones..OR VERY close to it..for a pair of their old classic skis..I come across stuff occassionally OR go look for it.I found 4 pair to "work with".Take a close look at the rear track..it is somewhat raised off the ski surface..the bottom of the track on the screw hole mounts is chamferred DOWNWARD..LOL..and they mount with a flat head screw.A little math here tells us that there is a HUGE potential for these screws to be overtorqued..AND the tracks bent.Take several pairs of these off skis and tell me what shape the tops of the skis are in.Tell me if the tracks are still straight.This particular raised track idea..especially the front adjustment(length)little gear and track is a MAGNET for crud.SO are the tracks where the actual binding housing rides.Were there worse bindings for this?Me thinks not.What happens(d) with these was that IF they got the salt treatment..OR crud in there..and/or
the track wore then MORE crap got in there.Pitted is bad.The heels got sloppy..but WORSE! Ever tried to get one of these sloppy diagonal things back on..in deep snow?On the steep?.These had pre-release issues as they aged..BECAUSE the actual heelpiece was jammed in it's track..OR could barely move back and forth.NOTORIOUS for seized/no or little forward pressure control/movement.Sometimes the crud built up so bad underneath the housing that the actual spring was almost full.
Out of 8 heelpieces..including the tracks..4 were serviceable..4 were junk..I rebuilt 1 set..tested them.And sent them out both SAYING and KNOWING that I'ld trust them with my life.In their day..others did too.Would I ski in or reccommend that ANYONE else ski in a set..that wasn't rebuilt?..or rebuild a set themselves..Of COURSE NOT!..
The other set I put on Ebay .."As Is"..I also offerred to adjust,test them for additional $..these too went out almost the same as the first pair.
On these particular bindings..they obviouslly have toe and heel height adjustment ..release adjustments are simple.If the rear units are sloppy.Toss them.Don't think that if they are sloppy that cleaning,greasing will help..it'll help ya alright..TOSS YA "diagonally" lol..If they are ok..take them off..turn them over..clean them up..and the tracks..grease them with plumbers grease.The forward pressure adjustment is controlled by the boot position for the sole length.It is impossible for me here to describe it.There are no specs for it.If one is/feels different..toss them.NEVER! try and compensate by moving the heel further forward.It is next to impossible to see(the forward pressure adjustment) without the boot in the ski..alone.Self release test them with your boots on.There are obviouslly other "feel", smoothness issues that I can't convey here either.
Newer bindings are safer..(design and otherwise)SOME! old(er) metal ones expertlly maintained are safe..FOR CASUAL USE!..the odd reasonablly hard "blast"..just how safe is ANY old binding when the din is cranked right up and they're run hard by a 200lb athlete? .NOT! for repeated use..and certainlly not for repeated hard use. just who?? you can get/TRUST to service old bindings should be a MAJOR! consideration..Indemnified bindings sell for about $20 used on Ebay.