What Steve is saying makes some sense. I have only had 2 tooth bars but I have used them for 9 years on 2 different machines. Both of them had a small gap between the bucket and the main cross piece on the bar. While some material does get caught between the bucket and the bar from time to time, it is usually not a problem. I have had small sticks (usually roots) and stones get in there, and dirt will usually fill the gap as well. Now I have had the odd piece of wood get in there that gets REALLY jammed in. Sometimes it takes a few raps with a hammer to get it out. But this never seems to affect the use of the bucket, just the end of day cleanup. Frankly, I have never found this to be a problem. What WOULD be a problem is if the bar was actually loose and was able to move. I think as long as the bar is tight on the bucket, any small amount of material that gets caught is irrelvent. As for obstructing the the dump cycle, yes, with loose material there will always be a little that gets caught on the back side of the tooth bar. But we are talking about less than a quart of stuff out of a 5-6 cubic foot dump. The only real problem this causes is with corrosion of the bucket if the material is left in there between uses. Particularly with barn and feedlot waste, That stuff has a lot of acid in it and it will damage the bucket over time if not cleaned out.Oh yea, one other thing that can be a real problem. I saw a guy using his loader to move wet concrete. He allowed the small buildup of material to stay under and behind his tooh bar over night. It took him about 3 hours of banging with a hammer to get it right again. About 30 seconds with a hose the day before would have saved him a lot of greif.