![Grille thumbscrews, dozen, part #330](http://hmtrad.com/cdn/shop/products/image_b2fa956f-a007-4833-9e1e-51a0d86cc31c_{width}x.jpg?v=1571359170)
Some accordions have easier access to the treble valves under the grille via a thumb screw instead of traditional screws. (No screwdriver needed). Two sizes in assortment: Approx. 3/8" diameter, 1/2 inch long; and 5/16" diameter, slightly longer. Not sold individually.
For more information on Accordion Repairs at House of Musical Traditions - click here!