My 300 resistor was completely broken off too and my 510 had a nice crack in it. However, after some re-soldering, it works awesome!Checking in here - I do electronics as a hobby so this was quite easy. Took it out, found the R300 floating around completely disconnected! So I resoldered all of the connections and it works like a dream. I also lost one of the rubber push thingies so I'm looking for those as well! Thanks again.