Originally Posted by
molleraj
Just did my longest ride yet on the Peugeot (50.6 miles) and my second half century. With that ride I hit 2532 miles for the year and 267 miles for the Peugeot. I took advantage of a sunny cool day to make a loop through some cool neighborhoods around Rockville (Fallsgrove, Scotland, North Bethesda, Grosvenor-Strathmore, Garrett Park, Aspen Hill, Glenmont, and Layhill, amongst others). I will post photos soon.
Something unfortunate happened in the last mile of the trip, though - the freewheel gummed up to the point of stopping. I was worried this would be a difficult or expensive fix but 30 minutes and an RJ the Bike Guy video, and the freewheel turns good as new. I just needed to flush the old grease (hardened by the cold?) with WD-40 and add in some new oil.
So sorry you ran into trouble with the freewheel.
While the "flush and dribble" method of servicing a freewheel is a short-term quick fix, it is not a substitute for a complete disassembly, cleaning, and appropriate lubrication with grease in the bearing races and a few drops of machine oil on the pawl pivots. Also, you have not inspected what is occurring on the internals of your freewheel. You could have a great deal of corrosion and/or other contaminants. Bearings can go bad. Pawls can break. Etc.
Based on this one picture (and the other distant shots photos)...

My guess is that you are running a Maillard 5 speed freewheel. When the wheel is off the bike, does it look similar to this one?
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Sometimes this model can lose the black plastic seal ring which helps to keep the internals clean. If it is missing, all kinds of moisture, grit, sand, and salt can infiltrate and compromise the internal grease.
Here's a picture of a Dura Ace I serviced. The DA models have great seals, but contaminants still can penetrate the internals.

If you'd like I can talk you through a self-service of your freewheel.