That secondary plug with an apparent missing electrode may be one of the alternative non-conventional designs.
For comparison, I'm attaching a picture of a GP head. It's an EMPI, made in Brazil. They currently have about 850 hours on them without any problems. This is _exactly_ the way they looked when I pulled them off after 500 hours - you can see I run some Chevron with Techron through them periodically :-) Mike KSEE ____________________________________________________________ Old School Yearbook Pics View Class Yearbooks Online Free. Search by School & Year. Look Now! http://thirdpartyoffers.juno.com/TGL3141/5585b78db743c378d04ffst02vuc -------------- next part -------------- A non-text attachment was scrubbed... Name: Heads8.jpg Type: image/jpeg Size: 91551 bytes Desc: not available URL: <http://list.krnet.org/mailman/private/krnet_list.krnet.org/attachments/20150620/a3f5364a/attachment-0002.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Heads9.jpg Type: image/jpeg Size: 196946 bytes Desc: not available URL: <http://list.krnet.org/mailman/private/krnet_list.krnet.org/attachments/20150620/a3f5364a/attachment-0003.jpg>