How fast was Rapid Robert Feller?

http://espn.go.com/blog/sweetspot/post/_/id/57040/tbt-how-fast-was-bob-fellers-fastball

The machine, called the "Lumiline Chronograph," used photoelectric cells to clock the object that passed through the device's opening. Feller's second pitch was the fastest one, clocked at 98.6 mph. Here's a photo of Feller throwing into the machine. Weintraub writes:
However, since the machine measured the speed of the ball as it passed through its sensors, unlike modern radar guns that clock the ball as it leaves the pitcher's hand, it actually flew much harder. Some estimates put the fastball at 101-103 mph, others as high as 107.6 mph.
Feller then started the game (and lost).

I have serious doubts about the 107 mph estimate. For one thing, if Feller threw that hard, or something close to it, I think that would be reflected more in the numbers. He didn't even have the highest strikeout rate in the league in 1946; that belonged to Newhouser, who struck out 8.46 batters per nine innings compared to Feller's 8.44. Now, Newhouser was no slouch, a two-time MVP who also finished second in the voting in 1946 (Feller was sixth). He probably had the second-best fastball of that era. But nobody asked him to throw into the Lumiline Chronograph. Plus, it's hard to know, 70 years later, how precise the Lumiline Chronograph was. On the other hand, it's also possible that Feller didn't throw as hard in 1946 as he did in 1938 or 1939. Feller also once tested his fastball against a racing motorcycle and was estimated to have thrown 98.6 mph that time as well (or 104 mph by some modern estimates).
There seems little doubt that Feller had one of the hardest fastballs of all time. I'll buy that he could throw 100 mph, although it's impossible to know whether he did that consistently within games.