what is the correct sparkplug setting for a craftsman 31cc trimmer?

what is the correct sparkplug setting for a sears craftsman 31cc grass trimmer
robert dent, June 2005
If the original spark plug is Champion RCJ-6Y, the setting is 0.025 inches.If the original spark plug is Champion RDJ7Y, the setting is 0.020 inches.Please verify the original spark plug number and setting using the model number of the grass trimmer.

marcos, February 2010
link Click here to see other fixes for Craftsman.