I'm hoping someone can help me with a problem I've been having with my IHC #9 Regular Gear mower. When mowing tall heavy grass it works great, but in light or fine stemmed grass the hay gets jammed in the hole at the end of the bar (the base of the grassboard). This causes the mower to plug and I have to continually get off the mower and unplug it. It is especially bad in this fine-stemmed Teff grass that is pictured. Sometimes the hay gets packed in so tight the sickle starts pounding and pulls hard. I have attached photos showing the hole open and plugged. Does anyone have any idea how to prevent this?