I got a Durst 606 enlarger recently. It comes with a adjustable negative carrier. The vertical blades were alraight untill I adjust near to the far-end for 120mm 6x6. The blades on the right are positon unevenly. It form quadrilateral instead of a square. Are there any way to fix it? Condenser lens have some microscopic scratch on it after I clean out the mold. Microscopice scratch which I mean are scratches that you cannot see untill shine underneath strong light same as glass ware. I'm courious will it effect quality.