I recently purchased an old style Pelikan M150 with a medium nib. The pen is in excellent condition and may be NOS. Out of the box the tines were out of alignment. I removed the nib and feed from the pen and realigned the tines in the usual way. The pen will write well for a few words then the tines become out of alignment once again. I have tried pushing one tine over the other, then under the other, then push up on one and down on the other but the tines will not stay aligned. I have a light touch to the paper and do not press down on the pen. Is there anything else I can do to keep the tines aligned? Any suggestions will be appreciated.