take a paint brush bristle (from a houehold paint brush) and then dip the end in pva, let dry. repeat the dippinguntil you ahve a nice oblong shaped lozenge at the end of the bristle. Paint, job done.
Obviously the bristle needs to be strong enough to hold up the PVA hence using something \"thick n strong\" like a household paint brush bristle - but you cna substitute all sort of things.
If you want a quicker way just replace the PVA with superglue/CA and set it fast using Blaster (CA accelerator)