As soon as the brush wears out I buy a new pole complete and flog the old one, so about six or eight months maximum.
New pole, including new brush, delivered, £240. Sell old pole for typically £180 (It still looks brand new so I get a good price). Cost £60.
New Supreme brush, £43 including shipping. £17 less. So for under £34 a year I get a new pole every six or eight months. No spinning, no replacement clamps, perfect working order at all times.
Vin