Look on the bright side, mate

You got it for next to nothing, and you've found out it's not an economic fix before you've wasted days, weeks, months, trying to sort the jetting

I'd call that a result
God knows what the history of that slide is, it's a right state and, anyway, the cutouts too big and is defo for a leaner running bike, and will be no use on a 185 (is that what you've got?). PWK33s use a bigger cutout, possibly like that, which I've heard of being used on TS1s in Germany but, believe me, even if it didn't have a chink missing, you'd never get it running right.
I know all this

because a couple of years back I bought a genuine PWK28 on ebay. Very good price, very good condition, but a chrome slide that was for a bike. From memory, I was quoted £48 plus VAT for a new slide____________needless to say, the carb's still in the garage to be used as spares for my other Keihins.
As I said on an earlier post, pass it back to your mate, and buy another carb
