spacing notes question

[Chip]

r16 a a8 a16 a8 g16-\bendAfter #-4

In the above snippet the drop at the end of the measure is cut short by 
the barline. I reviewed the info in the manuals about spacer notes but 
just don't get how to insert a little extra space between the barline 
and the drop. Right now the drop line gets cut very short, almost to a 
drop glissando. I've tried adding s8 or s16 etc but that just results in 
a measure error.
How do I resolve this?
--
Thanks,
Chip