Instead of the metal plate, Paulstra offers a rubberised cover which has the following advantages:

– only a simple shape needs to be machined in the crankcase.
– only one part needs to be fitted to ensure the closure of the crankcase with a perfect seal.

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In a crankcase, it is sometimes necessary to have temporary access in order to:

– machine an internal shape which is otherwise inaccessible.
– carry out a mechanical adjustment at the time of assembly.

This type of temporary passage is usually closed by a screwed plate with a flat seal or an O-ring.