Nagra PORTABLE ANALOGUE AUDIO TAPE RECORDER Instruction Manual - page 42
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6.3. LUBRICATION
In the case of intensive use, it may be necessary, from time to time, to lubricate the ruby pressure
ball on the take-up reel clutch. This ball can be found in the middle of the pulley, which drives the
take-up reel. The best grease to use is an Esso grease, but if the recorder is not to be used at very
low temperatures, any mineral grease can be used.
For other oiling points, use an oil designed for aviation instruments, such as Isoflex PDP65 from
Klüber-Munich, or P10 from the Bendix Aviation Corporation, USA; but once again, for recorders
not to be used in very low temperatures, any good sewing machine oil should be acceptable.