I got this part from Digikey (PN2222AD26ZCT) - but I think it was not a transistor generally supplied for MS which is why it might differ from this pic in my installation.
I used this photo as a reference - so can totally see what you are talking about:
Bill's pic from the Assemby thread:
(BTW, click on the photo to see the full-sized image)
My Pic:
I think I used the 'mark' on the top of the transistor to determine orientation - not the curvature of the trans. You can see the marked terminal (leg) is on the left in both instances. Perhpas it is in the wrong way around - I'm a complete beginner in electronics so was winging much of this...
The circuit definitely works though - would it work if it was reversed?