Pat, I have an 05 TBA, and the slides weren't drilled, I used the 7/64 bit, and it removed just a bit of material. Throttle response increased noticeably.

'05 TBA, Freak/152.5 mains/48 pilots/Gutted Shotguns/AI/Custom rear hangers-Chain Guard/Sport signals/Ness Mirrors/Kury pegs/Driver's Backrest/LOTS OF CHROME!