[Andy Brockway]

<R85> allows you to remove the pin but you are not allowed to "file, machine or abrasively remove any part of an air cylinder".

So you cannot enlarge or machine for a key. You can bush if the original hole is larger than the motor shaft. You cannot machine the hole larger if it is too small. Pressing the cylinder onto the shaft 'as is' could fall under the "abrasively remove" clause.