Hi Dale,
Gernold is the expert on soft tops and frames, but from my limited experience... if you remove the 2 springs on each side of the frame, and then loosen the 2 bolts on each side, the frame has some "give" and will slide around a bit. In addition, there are shims on each side, under the frame. The shims are very thin pieces of metal and each side has approx 4-5 shims. These help with adjusting the height of the frame to the windows.
Hope this helps. I would also email Gernold. He has the most experience with the 113 soft tops.
Regards,
Bob
bpossel
Memphis, TN.
1971 280SL
1997 E320