Never took down a Merkel, but most guns other than most British require you toremove the sear assemblies.
Most guns of an elderly age can benefit from a good scrubbing. I have become a big believer in molybdenum disulfide grease. A small 1 or 2 oz jar can be passed down to your grandchildren. I started using it when building benchrest rifles. Even a a-2 oz target trigger will usually benefit from it and I never saw a trigger, no matter how light, that started failing to stand cocked when treated.
Moly is the material that was used in STP when Andy Granatelli started marketing it for performance cars back in the day. It has the property of bonding on the base metal and the Moly atoms ride on the steel and reduces the coefficient of friction. It lasts a long time and only requires a small drop on a toothpick tip rubbed on the contact point between the sear and trigger.
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