Four days before he was set for trial, a 31-year-old Gardnerville man pleaded guilty Friday to charges he waved a knife at a sheriff's deputy and stalked his 47-year-old former girlfriend.In a two-hour hearing before District Judge Michael Gibbons, Springer admitted the felonies which carry a maximum sentence of 21 years in Nevada state prison and a $10,000 fine.He pleaded guilty to aggravated stalking, and assault with a deadly weapon on a peace officer.In exchange for Springer's guilty plea, both sides have agreed to recommend midlevel sentences of 4-10 years on the stalking charge, and 1-6 on the assault charge, …