Re-lacing shoes
If you climb cracks, you will break the laces on your shoes. It’s just a fact. Chances are you’ll likely break the laces on your approach shoes at some point as well. It’s not easy to re-lace shoes without aglets, but with the right tools it is possible.
Before you begin, measure the length of your laces. While you could purchase actual shoe laces (with aglets), cord is cheap, readily available, and sold by the foot at nearly any climbing shop. I recommend 2mm diameter. You won’t be able to choose the color, but at least you can tie your shoes. Take the existing lace out of one your shoes to get the right length. Consider buying one or two extra lengths so you can have a backup always on hand.
When you finish, tie an overhand knot in the end of your laces to prevent them from coming undone. As a bonus, this will make un-tying your shoes exceptionally faster.