How old is the Grabber? It seems unlikely that a few pellets would tweak the collet in a fairly new machine, but in a machine with a very old collet, it might be the straw that breaks the camel's back. I had one that was probably original to my (old and well-used) machine that worked OK most of the time, but was a little cranky. Took it out to clean and lube and a broken finger fell out. I was surprised that it had worked so well.
By all means - try tweaking gently. If it's not working now, you may restore function, otherwise you're gonna buy a collet one way or the other. I'd be tempted to remove the collet altogether, clean it real well, inspect, lubricate and reinstall. The collets are pretty expensive - I found a new old-stock one on ebay for about $25, IIRC.
And yeah - to Nebs' point: you'll find you get more meaningful and helpful responses if you include some indication of the subject of your post in the title. Just a suggestion.