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E3.16 or champion RDJ7J
Two compatible spark plugs for a Troybilt weed whacker that currently has a spark plug with a model number of 794 00055 is the Champion E3.16 or the Champion Spark plug RDJ7J. Both of these spark plugs will give your weed whacker the starting power needed in a replacement. You can buy them here http://www.mymowerparts.com/partdetail/1060/1042/10783.php
No clue why you ask, but Autolite 308, NGK BR2LM, Bosch WR9EC, Briggs # 802592s, Tecumseh 35395
Some compatible spark plugs for MTD Troy Bilt 794-00055A are NGK BM6F and Champion DJ8J. You will be able to find these in any auto parts store.
Champion Spark Plug Co. is currently owned by Federal-Mogul.
Champion J6C
The compatible spark plug is numbered 791-610311B. The spark plug body may have 794-00050 on it.
Champion RDZ4H
Champion 3071
If you damaged a Champion RJ19HX spark plug, then you can indeed replace and substitute that with a Champion RJ19LM spark plug due to the similarity in their sizes.
This plug is the Champion RCJ7Y.
Champion RCJ6Y