Riding home a couple of days ago in rather poor light I became aware that the headlamp had turned itself off. A few minutes fiddling with the light switch made me realise that there was something going on with the contacts - I could wiggle the handle and the light would flash. This needed further investigation.
As far as I could tell from various blog posts, this original Lucas U39 light switch had not been apart for probably 10 years. My own skills and knowledge have improved immensely in that time and I now clean these switches with an ammonia based clock cleaning solution as shown in this post.
The one on the bike was clearly a bit grubby.
I stripped it out and immersed it in a 25% solution of ammonia-based clock cleaner for about 4 hours.
After a few hours, the brass parts emerge without the tarnish and looking a lot more and conductive!
Here it is again, reassembled.
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