I got some #24 cave line and a new DGX 600 light and a bolt snap from DGX.
I tied the bolt snap to the light using the cave line, following the directions here:
https://www.divegearexpress.com/library/boltsnap.shtml
I took my time. I double-checked the instructions. I believe I followed them exactly. I pulled the line as tight as I could when I performed step #5. I melted the ends of the line and mashed them with the end of the lighter.
Then, I turned the light on and left it on for a while to put the battery through a full discharge/recharge cycle. The light was pretty hot after a while, so I filled up the kitchen sink with water and put it in there.
Almost immediately after putting it in the water, I could see that my knot holding the bolt snap had loosened quite a bit.
Can someone share some wisdom on how to do this again where it will stay tied?