constant flashing relay

I need to create a flasher for my friends cycle cab. We switched his bike from incandesant bulbs to LED's to lower the current draw but now his blinker doesn't work. I'd like to create a flasher using a relay that starts flashing once he turns on the blinker switch. I created a single flash using the momentary pulse relay diagram on this web site but I need it to be a constant flashing mechanism. Thanks for any and all help!

Put a capacitor , a real flasher is a kind of relay whit a capacitor in it, the time between each flash will depend of what kind of capacitor you will use. I cant say what capacitor is the best for but , im working on exhaust flames thrower whit 2 relay and a capacitor. Im not gonne say how to do my system because its dangerous. dsrq