If I understand you correctly the outside lock and the inside lock should clamp the door together so you shouldn't need anything else.

http://www.dummies.com/how-to/content/how-to-install-a-deadbolt-lock.pageCd-storyboard,pageNum-18.html


Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6
Feb 2006, left, came back in two weeks
Aug 2006, left again
Apr 2007, filed for divorce
Dec 2007, reunited
Mar 2010, moved out, filed again