Finding the right 7-speed freewheel really took me some time and effort. Since i found only scarce info on freewheels here in our forum i thought i'd share some of my own conclusions.
What i learned during my research is if you want a quality 7-speed freewheel and some MTB-friendly grading at the same time you basically have two choices:
Shimano Dura Ace 7400 series and Suntour Winner Pro.
All the french and italian quality ones are either 6 speed or the largest sprocket is something street orientated like 26 teeth. Regina, Atom and so on.
I also checked out some newish Shimano Megarange and Sunrace freewheels and my personal impression is these are made out of cheese. (Of course no offence to the great LGF!
And here is a last thought which is no personal experience but more than once i read that if you are looking for a freewheel stay away from 8-speed ones which will often result in a bend hub axle because of their bigger leverage against the hub.
Back in 1991 i used a Dura Ace one which consisted of actually two freewheels merged into one to get the right grading. After a few years of riding the hell out of this freewheel i couldn't get this thing off of my Ringlé rear hub any more. 2 local bike shops said they won't even try it because they would destroy the of course much softer hub during the job. A third shop said no problem and destroyed the freewheel but at least saved the hub.
And this is how my lovely wheelset ended up in my cellar all these passed years.
It took me about 3 years to sort this new freewheel. It is a new old stock Suntour WP-7000 Winpul 7S-S which was made in 1985 or 1986 i guess.
It weighs 545gr and has these sprocket numbers: 12 - 14 - 17 - 20 - 23 - 28 - 34.
It has a BSA/BSC threading and the thread depth is 9 mm.
It arrived a while ago but because i really have no clue if this thing will fit right away i thought it could not hurt to wait a little longer till the matching 4-prong freewheel removal tool (Park Tool FR-3) showed up, which was today.