Fixing the Meyer-Optik Görlitz Domiplan 50 f/2.8

[fotomachi]

I got said lens with a Praktica LB for 15 euro. I really like the looks of this lens: small, light, zebra finish. It has the Royal Screw mount but when I wanted to screw it on my Pentax (with adapter), I noticed a problem with the diaphragm pin. I wanted to fix it by using super glue (putting a small piece of hard plastic on top), but the pin always loosens up. Do I have to open the lens and fix the pin somewhere inside (I never opened a lens before) or should I get stronger super glue? Attila had a similar problem it seems.
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My glass --- fotomachi Lens Test Page

[Puplet]

If you squeeze some glue out onto a piece of card, use something to wipe some glue round the base of the pin, push in with a cheap screwdriver and hold. I've just got the same lens - and this has worked for me.

[peterqd]

I just jam the pin on mine with a little piece split from a matchstick and wedged down beside the pin. Easily reversible too.
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Lenses: M42 - CZJ 2.8/20, 2.4/35, 1.8/50, 2.8/50, 3.5/135 - Meyer/Pentacon 1.8/50, 2.8/50, 2.8/135, 4/200
Russian - J9, J21, J37A, M1v, M24m, I50-2, H44m-4 Vega12
Takumar 3.5/28, 2.0/35, 3.5/35, 1.4/50(x2), 1.8/55(x2), 1.9/85, 3.5/135 - Vivitar 2.8/28
K-mount : Pentax-M 2.8/28, 1.7/50 - Tamron zooms :SP28-80, SP35-80, SP60-300, 80-210
DSLR:Canon 400D 35mm SLR: Pentax Spotmatic SP, SPII(x2), SPF, ESII, K2, ME Super, P30 - Chinon CE3 - Minolta XG-M - Praktica Nova 1B, PLC2
Rangefinder: Zorki-4, Beauty Light-o-matic III Medium Format: Yashica-Mat 124G