I've just used a dull screwdriver and determination .... I'd be careful with anything as pointy as a dental pick ... NAPA has a Lisle tool for glass retainers, don't know if it's the right size
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics