Some accountants feel so passionately about the bottom line that they rewind their adding machine paper and use the other side. So Jim Stubbs and Gene Gumplo designed a gadget to do the job for them. StubbSaver, a $12.95 bargain only a tightwad could love, took six years to create, and pays for itself after about 20 rolls of tape. Instead of feeding onto the desk, the paper rewinds onto a roll on the back of the adding machine. Two of Gumplo's friends were so impressed, they presented a StubbSaver to Japan's Emperior Hirohito.Next thing we know, millions of tape-rewinders will be flowing into the United States, underselling StubbSaver courtesy of the Japanese miracle.