John Ponting said:
mackle n. A blurred or double impression in printing.
mackle v.intr. To become blurred.
or did you mean
mackling (tr) Midland English dialect to mend hurriedly or in a makeshift way
The latter, of course. Funnily, although I spent 20 years living in Leicester from age 10 to 30, I didn't learn the verb "to mackle" until I moved to York and met a friend who had a friend who was an engineer from Oadby, just down the road from our house in Leicester. My friend, Tom, now sadly deceased, was a supreme mackler, and it's from him I get my idea that nothing is really impossible with enough zipties and p-clips and imagination. Of all my bikes, only the recently rebuilt Galaxy doesn't still bear some slightly bodged but perfectly well working fix.
And even on the Galaxy, the front mudguard has been made by cutting down a rear one, the only way I could get a matching pair of gold ones. I hope he approves.