Possible Clues:

• Tool beginning to turn with spiked wheel
• Small garden tool
• Flat-bladed tool
• Drier across river -- this is needed by a gardener
• Digger reversing into Isleworth
• Gardening or masonry tool
• Trouble in accommodation brings back Mason to handle it
• Garden tool received initially wrapped in cloth
• Small digger allowed to reverse round line
• Starting trouble and argument with fan at centre - it's what Mason has to handle