Those buggers are hard to find; I lost mine and now just use it as incident. Gerry, one thing you probably already know is that the attachment is a 40 degree reflective meter, as I recall, which means you gotta be pretty careful what you point it at! That's a pretty wide range and if you have something very bright or very dark w/in that 40 degrees it'll throw the reading off.
Incident is king for me although there are times when I'd like to take a spot reading.
I'll give it another whirl. Maybe I expect too much from a 40' reading. I think my LunaPro is 30'. I usually use the incident reading, but like you, sometimes a spot or semi-spot reading would be good.