Let me apologize for a mental lapse.  I should know that the "O" roll
will accommodate a single stroke xylophone as that is what my own Midget
Orchestra has.  I believe the Seeburg Style "H" may also accommodate a
single stroke instrument but I'm not really very familiar with that
model.

I've heard that "your memory is the first thing to go."  I'm getting like
the guy in the doctor's office who told the doctor, "I need help, Doc!  
I keep forgetting things -- can't remember diddley squat!"

After drumming his pencil on the desk for a minute or so the doctor asked
the guy, "How long have you had this problem?" and the guy said, "What
problem is that, Doc?"

Hal Davis