What, exactly, is the difference in terms of lateral forces at the pendulum pivot of a bug under these two cases: 1. A weight added at the end of the unmodified pendulum which slows the dit rate a specific amount. 2. A length extension to the pendulum which adds less weight to the pendulum but at a further point from the pivot than in case 1, but with the dit rate reduction the same as in case 1. Without doing the analysis, my guess is the smaller weight of the pendulum extension produces the same pivot lateral forces increase as the greater weight at the end of the unmodified pendulum. Thus wear and tear should be equal in both cases.