Thanks for the compliments ta0 & Chris.
@ Chris : yep, that idea came from Tom's mod. I noticed Tom trimmed the crown down pass the groove (for the ripcord), but I felt that was kinda low, as it would leave only a very narrow area for the top string to loop around. Hence the idea of filling the groove with epoxy so that I can determine the height of that crown wall i wanted. It also made it easier to cut through the crown (using screwdriver & drill). Without epoxy, the groove causes lotsa jerking and misalignment.
The initial holster did not include the bouncyball counterweight. Was figuring how to get the cord wrap around the crown without slipping off when it struck me in the middle of the nite i could pop a ball counterweightl in & out the hole, and its still secured enough! Hadda get up and work at it till i got the final product.

that few hours less of sleep was worth it.
the BK now has 2 rubber weight rings in them to give that extra rim weight.