Would love to hear about your easy way to switch to dual circuit brakes - balance bar pedal box by any chance?
I'll definitely include dual circuit brakes on future projects as the handbrake on my Spyder is the only weak point for the MOT and is always marginal. With dual circuit brakes it only needs to pull half the negative 'G' for a pass so would breeze it.
Dual circuit servos are available btw, but they're fairly expensive -
http://www.ebay.co.uk/itm/Compact-Du...UAAOSw5IJWb9Xr