Well, my newest adoptee needed a new belt. I tried all I had here and none fit. So I ordered one from Sew-Classic. Her chart says a 193077 fits the 328s. Well when it got here yesterday it did fit, but loosely even with the adjuster all the way out. Hmmmm, well I can use that belt on other machines so no biggie.
Today I went to the LSMG and his book said the same thing and his 193077 was too loose too. We ended up using an Alpha-Sew 1514 belt even though I didn't really want an orange cogged belt.
We discussed the light switch issue and he said there was three machines in that series. The 327, 328, and 329. His comment was the light switch was on one of the other series. Not sure I agree with him as the machine Mizkaki showed is a 328 with a switch.
I think, believe, my theory that the switch was a production change that came later in the model is more likely.
Joe