Thanks for the reply and photo Mick. My control panel doesn't look like yours. There is no folded edge to allow the tips of the clip to engage; it is just a smooth surface with nothing to grip against. As the bike was largely in bits when I got it, and the original switch had disappeared, I'm not sure that the panel is the right one for the bike. If I could figure out how to post pictures on here, I have taken a photograph.