Great Redeye! Model 66s were made for at least 50 years. Original and reproduction slide plates are easy to find. It uses class 66 bobbins (go figure
) and regular 15x1 sewing machine needles. Vintage bobbins are better than the cheapie new ones I've tried. Buying from a reputable sewing machine store might make a difference. Sew-Classic.com will have everything you need.
Rodney