Hi Bob, Years ago, I had the same problem on a car and I fixed it myself with some "Chemical Metal". https://www.amazon.co.uk/PLASTIC-PADDING-CHEMICAL-METAL-FILLER/dp/B004PIFZXA/ref=sr_1_1?ie=UTF8&qid=1490180123&sr=8-1&keywords=chemical+metal You just apply it with an old knife to the window and the contact and press the contact onto the glass. It sticks like the proverbial and retains a good electrical contact. After I had fixed it,  the contact stayed in place f
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