Glad to report that I was able to talk to ZDMAK today by phone tollfree and things should be straightened out now. He says I should receive delivery in about 6 days. He is quite difficult to get in touch with but seems to be a nice guy.--As for reaming out the glowplug holes---my understanding is that the heater portion of the glowplug gets coated with carbon making it difficult to remove after the threads are no longer engaged. additionally the carbon will absorb the heat making the gp less effective .Replaced mine already. #1 and #2 seemed to be the only ones mildly stuck . that's when I decided that I needed the reamer. I will be redoig the job as soon as the reamer is delivered. will report as to how it goes Thanks to all, Willie