I've recently bought a Durst Laborator 138... Really a nice enlarger. I started using it with a 80mm Componon lens. This lens requires just a normal M39 plate which I have. The problem comes with longer lenses such a Rodenstock 150mm I have here too. It's rear element is too long and the enlarger has a lens turret (one can mount up to three lenses at the time and rotate the turret to select which lens to use). Since the lens turret is rotating, the rear element of longer lenses inhibits the turret to move. As long as I know such lenses require a special "cone" holder that moves the lens rear element a little away from the turret... But I have no idea where to find one. For this Rodenstock I need one probably with M49 mount. The cone base diameter should be around 72mm. I tried on ebay but there are none in this moment... I also don't know how are they called. The standard plate holder for smaller lenses is called Lapla 39...
Can anybody help?