One is to change the length of the tube, and thus the length of the vibrating air column.
Schools can change the length of the school day, fire bad teachers and spend their money as they wish.
It's possible to change the length of the entire tube on a natural horn, but only by adding lengths of tubing called "crooks, " or by switching one crook for another.
Unlike their athletes (who still face a transferring penalty for breaching their letter-of-intent if their coach leaves), coaches have no waiting period when switching schools and until this change in the length of a scholarship, schools had no waiting period to replace a player dismissed under a non-renewed scholarship.
They promised a decision by the end of the year (Wednesday qualifies) and specified that any proposed change would not concern the length of putters per se that is, it would not be an equipment regulation but rather a rule of golf concerning the anchored stroke itself.
But that is only part of the spin bowler's art - and Muralitharan is also a master of the subtleties of flight, disguise, change of pace, line and length.
The RMT has been calling for staff to be moved to 12-hour rosters, which would see the number of working days change from five to three but the length of shifts rise from eight hours to 12.
BBC: RMT union consults over escalating Network Rail dispute
Or was he asked, as the government's Chief Medical Officer Dr Tony Jewell suggested on Radio Wales this morning, to write an arm's length report which set out the clinical case for change and bring his expertise to bear to make the case for change and deliver the killer argument for the government, and the health boards' case?
However, the Prime Minister's arm's length attitude to managing Northern Ireland isn't likely to change, and Ms Villiers will soon discover that when it comes to juggling issues like parades or dealing with the past, it's hard to keep all sides happy and easy to tread on someone's toe.
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