Broken Pre-Chamber tip and ball

[adamb]

Hello,
Recently My converted 240 to 300DT has been running rough, hotter, smoking and 0-60 times have incresed from 13 secs to 22 secs. It had begun to sound like a Ford PowerStroke with direct injection.
First thing I did was a stethascope test on each injector with little difference between them. Then, I decided perhaps it was bad fuel as I had recently departed from my usual 100% BioDiesel on a trip and filled with about 12 gallons of normal diesel at a Shell station. After the tank emptied and once again filled with B100, I had the same symptoms. I then pulled the injectors and found the problem.
Cyl number 3 pre-chamber had no ball in it. I removed the pre-chamber and was saddened to see that the bottom of it was missing as well - about the size of 2 peas worth of metal which must have made passage through the valves. I wonder what now to do.
I know the right COA is to do a compression and leak-down test, and if the cylinder is relatively low, then to remove the head and inspect. I can see the top of the piston, though, and don't see any impacted pre-chamber bits.
Anyone have a 617.95X series turbo pre-chamber for about 10 bucks and I pay shipping? Anybody ever have this happen to them? What did you do? What was the result?
My idea is to put it back together initially and then to see how it goes, but this makes the new TDI Passat wagon look even more enticing.
Thanks for your replies and I hope you all have a great weekend.
Adam B