Here is your chance to do the board a favor.
While you have this gun apart, please look for holes bored oversize or askew, signs of improperly hardened parts, and evidence of peening.
I had a 209H for a time that was a little later vintage than this one, but had ... problems.
Take some pics if you find any evidence of premature wear, and post them here.
TIA
First thing I did while taking it apart and immediately after.
Nothing significant found. Machining on the interior is not of the standard you would see on a contemporary Grulla, but otherwise sound.
