Hey Racnray,
Just a quick note from Red Deer, Alberta. A few years ago I did your throttle mod on a '09 Classic 1700, and it, along with an EJK really woke up the bike. I sold it last February (2015) and bought a Raider 1900. Loved that bike, but grew tired of wind and no 6th gear. I bought two windshields for it with the second one making a huge difference, but too late and sold it. Last year I got a 2013 Vaquero in the flat black color, and have been doing mods. (Yes, that means 3 bikes in one year . . it's a sickness) Big 3 with PCV as recommended by you, 21" front wheel, Roaring Toys mini Apes, sythe style mirrors, Alpine Amp, Polk speakers, etc. When I opened the saddlebags after purchasing the bike, I noticed a set of grips still in the package. Upon closer inspection I realized that they were a set of yours with the throttle mod! The previous owner never put them on! But I did straight away! I'd never own a Vulcan without your ingenuity.
Happy motoring,
Gerald