I agree. Avoid those boards in case we get a pulse blast. The last mechanical ones that they made were the 1020 and 1030. I love the needle up always. I've had 5 or 6 of the 1020s when I had the rug shop. I bought school machines off ebay and I think they had a lot of sand or just plain dirty. I had bought one brand new when it was considered an outdated model. I kept one for myself when I retired. I think that is the one I still have. They run about 400-600 used on ebay. Be real careful to get one that is guaranteed to work and had the foot control. I would not get one out of Florida. Too much flooding, hurricanes.
The best thing about them and one think is mentioned here is that they will still sew sick. I had to stay away from Coats and Clark thread, but it loved Guttermans. I would not be afraid of a real old "mechanical" Bernina.