Air blowing out bottom of nailer indicates problem with cylinder seal and/or cylinder spacer orings. Remove head and check seal at cylinder; if seal is broken or loose, replace with new. If seal is good, pull cylinder and check oring that contacts body of gun and oring between cylinder and spacer. Make sure body of gun is not scratched (sand with 400 grit paper if necessary). Parts are at www.toolpartsdirect.com. Good holidays
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