I just installed the left door glass in my '39. It went pretty well. The right hand side is being real difficult. I started the left with the front down then rolled the regulator up "into" it an it seemed to fall into place. What am I doing wrong? Also, what is the placement of the stud on the bottom of the channel? I thought it went into the slot for the smoker's window but it doesn't seem to fit. I'm puzzled. Thanks in advance, Rod