Here is a service manual for the Eisemann RT series magnetos to keep yours in fighting spirit. Very similar to the RC series but use a jump spark distributor in lieu of a carbon brush type. Both are excellent magnetos.
Now you know what that metal cover on the front is for. The mark on the gear is often hard to see but should correspond to the firing position when the points open.
A sharpening stone works well with rough points, then polish to a mirror finish with a fine stone or a Cratex stick. The Cratex stick is a handy tool for contacts. It resembles an eraser with abrasive in it.
The above describes setting the edge gap or internal timing. That is the optimal time to open the points relative to the position(edge) of the magnet to get the biggest bang.
The jump spark distributor needs a ventilator because there is some destructive chemical hanky panky going on. When there is an electrical discharge in atmospheric air ozone, a form of oxygen is created. that is the fresh smell in the air during a lightning storm. Oxygen happily exists most commonly in its diatomic form, O2 with two molecules stuck together. Electrical discharges cause formation of its triatomic form, O3 which can react with atmospheric water and nitrogen to make HNO3 which is nitric acid. Nitric acid is very corrosive. Venting the distributor cap will help minimize accumulation of ozone and nitric acid inside the cap and subsequent corrosion.
For some reason one will find these rotor/distributor shaft ball bearings defective and ready to fall apart. If that happens a good replacement can be found in a bearing catalog. It is not as wide so will need to make spacers but is readily available and inexpensive(a roller skate/skateboard bearing). It is rated at 20,000 RPM which is well past the red line or most if us.