He could be refering to the actual weight of the crank halves. Different saws use different cranks. Some older 044 cranks are thinner then their newer counterparts. A 10 mm 044 crank is lighter than a 12mm unit, and not just because of the rod. A 346 and 350 husky have very similar cranks but a 350 the crank weights look identical where as the 346 has different size and I assume diff weight crank halves for clutch and flywheel side. 064 and early 066 cranks are the same part number but I have seen a large variation in counterweight style, width, rod design etc depending on production date and application.