omg wrote: ↑
Tue Sep 03, 2019 11:26 am
AndersP wrote: ↑
Tue Sep 03, 2019 10:48 am
Takes a bit of enginering inside the tube.
That looks good, but how do you attach it to the bar, anything you can share with us, please?
There are a couple options here:
1) You could fill the centre of the bar with something solid (eg epoxy or plastic bar). Then drill and tap to accept an eyebolt.This would then use the threads as a bearing surface, to allow the eyebolt to swivel. If you went this route, I wouldn't be surprised if, over time, sand/salt got into the threads and stopped the eyebolt from swivelling.
2) Far more elegant (and relatively simple if you have access to a 3d printer). Use a locking nut inside the bar:
This comprises of:
6mm eyebolt, washer & nyloc nut all in stainless steel
Two 3d printed parts:
Outside the bar (and not essential)
Inside the bar (this is essential to give a flat platform for the nut to rotate on)
Finally. You need to make a 'spanner' to fit the nut, but this doesn't have to be very strong as you don't have to do the nut up tight, just overcome the friction of the locking thread. I just cut a slot in a piece of mild steel strip but you might even get away with hardwood (or a printed part that you push in from one side, then push out from the other?)
The external printed part can be bonded to the bar with 'super glue'.
Instead of a self locking nut a normal nut could be used with a thread locker (eg Loctite)
For info. I have made a bar like this (which is why I have the CAD files) but it is not yet in use, as I am still sorting out bar ends. It's a bit of a fiddle to assemble but quite possible. If using bar ends, it is preferable to have at least one that is removable in case maintenance is required.
A couple of things to bear in mind:
1) As long as you are not unhooking, the forces on the eyebolt should be relatively low and even if it comes adrift it shouldn't be catastrophic...you should be able to kite back to shore, though it might feel a bit weird!
2) There is potential for lines to get snagged on the eyebolt