Upgrading lock washers on trigger to frame screws

[shafferm]

If you are looking at a way of keeping the two screws tight on the trigger assembly to the frame. Take a look at Nord-Lock washers. Very interesting method of keeping bolts and screws from coming loose.
http://www.nord-lock.com
Here is a video that they posted comparing multiple methods of keeping hardware from working loose
https://www.youtube.com/watch?v=IKwWu2w1gGk
Here is what the Nord-Locks look like

I got the ones that I am using from McMaster
https://www.mcmaster.com/#91074A115

I have been adding these to several bows over the last year or so and have not had one come loose on its own. Bows I have added them to so far are M405, Exomag, Phoenix, and a Micro 355. The split lock washers do very little once they get compressed.

[frisky]

Very interesting! A little pricey, but if it doe's the job, its worth it.

[NEPAbowhunter]

Nice upgrade. Thanks for sharing.

[shafferm]

They are a bit expensive compared to the standard split lock washers they are replacing, although it gets pretty reasonable if you have several bows to install them on.

[nchunterkw]

Interesting but seem excessive for out needs. And they damage the surfaces.

Been looking nto these since an ME here at work showed them to me for a job we are working on.

https://www.mcmaster.com/#belleville-disc-springs/=19nz6fr

Should be much stronger than a regular split washer.

[shafferm]

The split lock washers are already digging into the finish and the hardware is out of sight when the bow is assembled. The belleville washers are a bit of an improvement over the split lock washers, although figuring out what specific torque to use is a royal pain to get right as if you go too much you overcompress them and then if you do not go far enough they offer very little resistance to keeping the bolt from loosening. The bellevilles also do not seem to show as much resistance to slackening under vibration. Have your ME take a look at the Nord Locks as well as they see much more widespread use in Europe versus this side of the pond.

[nchunterkw]

The split lock washers are already digging into the finish and the hardware is out of sight when the bow is assembled. The belleville washers are a bit of an improvement over the split lock washers, although figuring out what specific torque to use is a royal pain to get right as if you go too much you overcompress them and then if you do not go far enough they offer very little resistance to keeping the bolt from loosening. The bellevilles also do not seem to show as much resistance to slackening under vibration. Have your ME take a look at the Nord Locks as well as they see much more widespread use in Europe versus this side of the pond.

Thanks...good info.