Hi, All, I want to thank all of you, especially Hans, Rummy, Edward, Moonman who reached near-critical mass early on, Ian Hanna and others for taking time and trouble on and off line to offer me so much valuable help and advice on my board problems. In spite of the fundemental nature of the original questions, this thread became a rope - a sure sign that there are still issues and information our there to be shared and discussed on "old-hat" topics, even if they only serve to educate the novices and act as reminders to the more expert. This is an excellent forum - long may it continue to be so. I've found a way forward again as a result of all the help, and will follow up on Hans's lead about the technique of plating holes only as a way of keeping copper weights down in boards with multiple blind via groups. This sounds like an ideal way to build this type of PCB if the process is reliable and provides good connectivity to the outside layers. Again my profound thanks and appreciation. Peter Duncan [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------