My garage door had a minor crisis last week, the screws came out of the beam. More because of the awkwardness and weight than my technical cabbageness , I called out a company to fix it. They did this with coach screws in about 3.5 minutes, for £75, and "gave the door a service". It is sliding up and down like a dream now, which it hasn't done for years.
The service pretty much consisted of spraying something along the tracks and everywhere. I asked if it was WD40 (actually knowing it wouldn't be!) and he said no. I said grease then? He said no, that gums it up. I gave up at that point.
What was his magic stuff, as I want to get some.
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Lubrication new
Lubrication new