Posted by Greg Coffin [172.68.34.169] on Tuesday, September 13, 2016 at 10:09:58 :
In Reply to: Re: WC mystery holes ? posted by Keith in Washington [108.162.246.30] on Monday, September 12, 2016 at 20:48:38 :
I've been told the reason was to eliminate any RF generation due to metal parts rubbing together. Rubbing produces AM frequency that can be picked up by simple radio locators.