Juries--Jury Trials. All civil actions shall be tried to a jury of six members and challenges shall be

in accordance with Title 28 U.S.C. § 1870, unless all parties join in a written demand that the case be tried to a jury of twelve members. Such demand shall be filed on or before the time of the pretrial conference. All criminal cases shall be tried before a jury of twelve members unless waived, in accordance with Rule 23 of the Federal Rules of Criminal Procedure. Challenges shall be in accordance with Rule 24 of the Federal Rules of Criminal Procedure.