Well all know any audio accessories are over priced mast items are 6mm thread found out today running spikes are 6mm thread
for £3.55 you can get 12 spikes like these http://www.ebay.co.uk/itm/UP-Ultimat...oAAOSwbqpTw-bE
That`s just one example so if you are in the market for spike just type in running spikes on flebay cheap as chips and a massive selection as well