NTN screws loosening.... WTF?

[Professor]

So the other day I noticed something weird on my NTN. They felt funny and then I figured out why..... the plate mounted to the ski is coming loose. I take them off, tighten them and the screws get nice and tight. Today I make two runs (tightened them yesterday) and same damn thing. Other than the fact that they are tele bindings and therefore shitty, what else am I missing. I have mounted hundreds of pairs of skis in my life and know what a screw should do when it goes in a ski. So why the hell do these just come loose so easy? The fact that even the heel piece came loose just has me baffled

[bio-smear]

Those 4 screws take a lot of abuse. Try epoxying them in with an abundant qty of Loctite brand 50-min set marine epoxy. Don't strip 'em by overtightening. Let it set up at least 36 hrs in a warm env.

[Tick]

mine do the same thing. its a pain in the rear! I tighten them after almost every day on the hill. I haven't gone as far as epoxying them in, but i'm considering it.

I have NTNs mounted on a few pairs of boarsd. So far I've had tightening issues (Nordica Enforcer), sheared the head off one screw (Stockli Storm Rider S.Schmidt), tore one binding plate completely of the ski (K2 Obsethed).

seems to me that the binding / boot combo must put an unbelievable amount of tourque on those plates. Ive considered mounting them with 6 screws but haven't gone that far yet. Some of the custom plates (http://www.bndskigear.com/adapters.html) look like an interesting option, but as far as i'm concerned you shouldn't have to go that route. They shold work right out of the box without modifications!

-Tick

[El Chupacabra]

Have you noticed any chemtrails overhead?

[Professor]

I am seriously considering the 6 screws to see if it helps. Epoxy is not an option. After going to too many binding clinics when I mounted skis for a living, I swear every one of them (Marker, Look, Rossi, etc.) made me promise to never use epoxy. However, I am not above using some shredded steel wool and silicone in the holes. It works pretty well with spinners, so it might just do the trick on these. If not, I think my Super 7s are getting alpine bindings and my days of teleing will be over!

Edit cuz I cant spell silicone correctly on the first try

[Tick]

Have you noticed any chemtrails overhead?

no but i have a tinfoil hat on.

here we go again!

[squatch]

i've heard of that happening on NTNs. Same thing is happening on my dukes, but AFAIK it's only mine. No spinning, not a pull-out, just...unscrewing themselves.

[Reverend Spanky]

Hey I know I'm a jong and everything, but both the shop that mounted my NTNs and the manual they gave me called for binding glue on the base plate screws. No loosening so far, here.

Dunno if loctite would help, but no issues here! Also, the shop mounted 'em in the K2 screw holes instead of the Rottefella ones, but I'm not sure if that makes any difference. Probably just the jig they had.

[Professor]

Binding glue = wood glue which is the standard for most mounts. But for a change, it is not cutting it. So still looking for new answers (besides epoxy).

[Reverend Spanky]

Damn, swing and a miss. How many days you have on 'em? I'm curious if I should expect issues later, after 20 or so days out.

[Tick]

Binding glue = wood glue which is the standard for most mounts. But for a change, it is not cutting it. So still looking for new answers (besides epoxy).

mine have all had wood glue too. they loosen, but not much. i usually give them a half or so turns and go ski. they haven't gotten any worse either.

[Professor]

Well after today, I now have a few screw holes that are likely done. It is almost like the torque on the screw is low and down in the ski. The hole through the metal topsheet is still fine, but all the ski underneath one hole is just wallowed out. So either that one came loose first and flexed a ton before I knew it, or something weird is going on. As for how many days... 15 would be my best guess on these skis. A few of them might not even count as a "day" though

Edit: Oh and just an FYI, it is the rear holes in each ski that are beat up the worst. Guess I shouldnt have made those tele turns

[Core Shot]

Well after today, I now have a few screw holes that are likely done. It is almost like the torque on the screw is low and down in the ski. The hole through the metal topsheet is still fine, but all the ski underneath one hole is just wallowed out. So either that one came loose first and flexed a ton before I knew it, or something weird is going on. As for how many days... 15 would be my best guess on these skis. A few of them might not even count as a "day" though

Edit: Oh and just an FYI, it is the rear holes in each ski that are beat up the worst. Guess I shouldnt have made those tele turns

wow.
shear forces down low.

Maybe its crappy soft pulp wood in those cores??

Go for EPOXY
Its the only realistic solution.
Your problem is obviously more than just spin out, you are compressing the wood fibers. Only epoxy can help that.
Or else try the binding insert group buy deal

[DropCliffsNotBombs]

Those 4 screws take a lot of abuse. Try epoxying them in with an abundant qty of Loctite brand 50-min set marine epoxy. Don't strip 'em by overtightening. Let it set up at least 36 hrs in a warm env.

^^^Agreed.

[tuco]

^^^Agreed.

Agreed +1.
After a binding working loose on Deseret Peak on the first run of a backcountry weekend and having to ski out with a duct taped on binding, I swore I would never mount a ski without epoxy(definitely don't use silicone, that shit sucks). That being said, quit fuckin' around and epoxy them bitches up, it won't hurt the ski. The only downside might be that it is harder to remove(little heat, good screwdriver), but that's a better problem to have than loosening screws while skiing, or worse a pullout.