Driven and non-driven rotatable tine assemblies for a turf aerator

A tine assembly-comprising, in combination:

• a tine plate rotatable about an axis, with the tine plate including a periphery and a plurality of non-intersecting, generally semi-circular cross section cavities formed in and extending into the tine plate;
• a plurality of tubular tines, with each tubular tine received in one of the plurality of cavities extending tangentially to the axis for a length, with each of the plurality of non-intersecting, generally semi-circular cross section cavities intersecting the periphery and having a constant size from the periphery for the length;
• a single bolt extending diametrically through each tubular tine, extending through the one of the plurality of cavities, and connected to the tine plate, with each tubular tine being removable from the tine plate by removing only the single bolt;
• and
• an attachment ring, with the tine plate located intermediate the attachment ring and each tubular tine, and with each single bolt connected to the attachment ring.