Hi, I have a MTD 317E640F000 snow blower and I just replaced the two auger belts. However, when I engage the augers, only one of the two belts has tension, the other is very loose. I have seen some auger pulleys with slots for adjustment, but this one looks like all it has is nuts on either side and both of the pulleys do not appear to be independent. The manual gives the belt P/N of OEM-754-0430 (QTY 2). I would post a picture but do not see attachment for upload here.