This is what I made (hope pictures make sense):
Here it is in use:
In my case, I threaded the hole in the centre of the aluminum piece to be able to have a bolt there - need it for tying off (I use my poles as an A-frame at the entrance of my GoLite Lair 1). If you have the poles under the fabric, just forget the bolt. To secure the poles, wrap the webbing around the pole grips and introduce into the ladderlock.
The reason I did it this way (poles right-side up) is -1- I don't want the pole grips resting on the ground (because they'll get wet) and -2- with the tips on the ground they won't slide apart (as the pole grips could do). Furthermore, you avoid the problem you address (tips damaging fabric).
Don't hesitate to ask if you have any questions.