lasco jacuzzi

We have a very simple bathtub size jacuzzi almost 25 years old. The switch has broken off. It's a disc with a short stem ending in threads. It apparently needs a screw attachment to reach the switch which works if you stick a small screw driver into the hole. Any ideas about a screw attachment?????

FWIW, if you have a Lasco product, you do not have a Jacuzzi product. Jacuzzi is a brand name, not a product type, just like Kleenex verses tissue. Have you tried Lasco's website?