Just received an 11 tooth pulley for the motor from Jamie so the axe is back on track. Not sure how powerful it will be as the ratio now will only be about 3.5:1 but only time will tell, so once i've cut 15mm off the back of one of the bulkheads, bolted the motor down, made up a chain and bolted the whole robot back together it'll be ready for a test, still got loads of time right? . If the axe is too underpowered for my liking i'll order a cheap 58 tooth mini moto sprocket from ebay and bolt that to the existing sprocket thus bringing the ratio to just over 5:1.