I was going to post this with another tech topic, but thought it better to just let it stand alone.
One BSA shop told me this and it stuck as an ultimate truth: "When you're restoring a classic motorcycle, you're going to end up throwing some money away." (This, to soothe me after I destroyed my QD rear hub when trying to lace my own wheels.) So, if you can buy a part that you actually need, and is not a waste, you are that much to the better. Suffice to say, the same applies to time.
Richard