Thanks for the head's up. I'm now using the shockcord trick after having my Mnt. Washington 3 wanting to slip over to one side. Very, very, rude awaking, going from toasty warm to Brrr cold in the middle of the night!
But after attaching the shockcord, I have no complaints. Maybe Jacks will offer an option to include a shockcord with hooks for a small fee for future Blackbird owners that order their UQ's. Just a suggestion.