Hi Nube, These certain Baits are shelf life, they will quite sofr, also 12mm on a swivel, I would personal think they will split, I use Bait screws for all my Baits, Pop Ups, wafter, bottom Baits... If ure using 12mm, a thin needle for a hair rig or bait screws would be best.
I use the Manilla and keep mine stored in the bag they come in... No air drying or nothing.