In article <4g3ofk$rkb@mars.hyperk.com>, glh@srv.net says...

>I would add one caveat: the counters in most bulk film loaders are
>not high precision devices. Both my Watson loaders tend to let the >film jump off the sprocket occasionally. This is not a problem if
>you just figure out the relationship between # of frames and number
>of turns on the crank. For example, 31 turns will give you a >36-exposure roll with what I consider a normal amount of leader. I >ignore the counter clicks and count turns instead; it works more >reliably as long as you don't get interrupted while counting.

On my Watsons, I find that if I let the counter go once around, then
add 2, I have 35 exposure rolls. (For instance, if the counter reads
"16" at the start, I crank until I go past "16" to "18" to finish -
works every time.) BTW, I have been rolling for years, and have never
had the film come off the sprockets - but I keep pressure on the lid
while rolling.
Hope This Helps