Kevin dropped by and lent a welcome hand finished up drilling the smaller access covers and then we began installing the access covers on the wing. Initial pix show a more accessible part of the wing skin; Kevin & I used a piece of 1⁄8” plywood to hold the skin flat while putting the ring down. Later pictures show that the location in the skin doesn't have easy rear access, so we contact-cemented in a piece of the plywood to hold the cover in (for sizing the cover as well as stiffening the skin.)