Support services is not the same as manufactured product. I spent half of my 30 year career as an engineer in metal fabricating manufacturing environments. No manufacturing company can run one-offs and stay in business unless you are a prototype shop. It is all about set up time and the efficiency that comes in running volumes. Many companies that have distributor networks, require them to keep minimum stock. There are all kinds of payment options for them to carry that inventory. For example, Bendix manufactures military spec electrical connectors. They gather up orders from their distributor network, and only run two production runs every 12 months. If you just missed a production run, and your distributor has no stock, you are $hit out of luck, and will need to wait 6 months. Ask me how I know, because it happened to me.