Roleset bolster.01 Verbnet Class: NONE "cause a (small) increase in, strengthen":

Roles:

Arg0:causer, agent


Arg1:thing increasing or strengthened


Arg2:amount increased, EXT

Examples:

transitive active (-)
In addition to those measures, the company spent heavily earlier this year to install displays at its customers' retail outlets -- a strategy that Mr. Stein said *trace* has helped *trace* bolster awareness of the company's brands.
Arg0:	*trace* -> *trace* -> that -> a strategy
REL:	bolster
Arg1:	awareness of the company's brands




transitive passive (-)
London share prices were bolstered *trace* largely by continued gains on Wall Street and technical factors affecting demand for London's blue-chip stocks.
REL:	bolstered
Arg1:	*trace* -> London share prices
Arg0-by:	continued gains on Wall Street and technical factors affecting demand for London's blue-chip stocks




with quantification (-)
The company also said the transaction would bolster after-tax earnings by $3.25 a share when completed.
Arg0:	the transaction
ArgM-MOD:	would
REL:	bolster
Arg1:	after-tax earnings
Arg2-EXT:	by $3.25 a share
ArgM-TMP:	when completed

This verb might also show start and end points like 'rise' etc, but I doubt it. If they do appear, refer to 'rise' for proper arg numbering.