Chuck and other old timers will remember these...
The old DGA mach II baskets and even older mach I baskets actually had bigger nubs,
They were affectionally (not really, more likely cursed) referred to "the eyes of Headrick".
This might be part of it. Cornwallis Rd. Park, 5 minutes from my house, has Mach IIs.
Plus I have a Lightning DB-5 as my practice basket.