1. No, the drill bit is smaller than the screw since you thread the screw into the hole you drill with the bit. Why you need a 4.1mm bit for a metal ski is because metal is harder to thread with the screw, you could pull up your metal or titinal layer as you thread the screw if you have a hole that is too small and therefore it’s better to have a bigger bit size. For almost all wood core skis, 3.6 (a lot of people use 3.5 but it isn’t really different) is the correct bit size to comfortably thread the screw into the ski.
2. I’ve bought jigs. You usually buy them from reps and they often won’t sell them to non certified ski techs for obvious reasons. You can buy used jigs from shops sometimes if you know someone. They used to sell jigerex jigs, which had plates for different bindings but I don’t think they sell them to the public anymore.
3. It’s been years since I’ve seen a Tyrolia jig but the 92,94, 88 etc is referencing models you can mount with that jig. I think aaatack series is 92w (which should be up to 108 waisted ski and they sell a 92 fat for bigger skis). I’ve never bought a jig on eBay. If you buy a jig off eBay, there is no guarantee the seller knows what they are selling. Long story short, a paper jig will save you money, you won’t have to store it when you are done, with some patience you can be as accurate as a jig, and it’s really not that hard. Or pay 50$ for someone else to do it. A jig is overkill for mounting your own skis.
DolanReloadedDoesnt the drill bit size need to exactly be the same size/spec That the screws that come with the binding are? Also how do u know jigs are hundreds of dollars? On google shopping and ebay the tyrolia jigs are like 50-80 bucks with free shipping. They all have numbers on them though like 92 or 88 or 94. Is that the year they were made or the max waist width of the ski that the clamps can stretch to?
Interesting.