Contact a guy named Larry Wiechman. He does push-button and cable operated compression releases for the 500's. Had him do my CR500 and now its starts as easily as Cr125. Seriously I can start the beast in flip flops now! And the price is only like $100, just send him the head and it comes back looking done right from the factory. He's well known on the KX and CR500 forums. Wiechman@charter.net