Timing adjustment on pfaff 2056 (not 7570)

Question

I emailed you a couple days ago and described a timing problem I was having on my Pfaff performance 2056.  I tried the link you provided via FixYa and was unable to connect thru it.  Coincidentally my timing issue rectified itself.  I have no idea how it did this and this isn't the first time it has done this.  I would still love to get instructions on how to adjust the timing.  My email is [e-mail]

Thank you sincerely for your time,
Elsje