The "clunkiness" can be caused by dirt, corrosion, broken pawl(s) or ball bearing(s). Flushing probably dislodged the "clunk" and converted it into a "lock." There's no way to evaluate the cause with the freewheel assembled. 1. Remove the chain guard by removing the snap ring. 2. Remount the freewheel to the wheel with a tire inflated to approximately 15 psi. 3. Using two chain whips, unthread the two smallest sprockets (IIRC). The remaining three are splined and should slip off. However, the middle sprocket might also be threaded. 4. With the wheel facing you, position the two small holes at 3 and 9 o'clock. Having another person hold the wheel helps but this can be done solo. Using a hammer and punch, strike the 3 o'clock hole down towards the floor. It has reversed threads. Once it is lose you should be able to thread it off easily but sometimes the punch and hammer is needed to the end. 5. Before threading the retaining ring/outer bearing race off completely, flip wheel to horizontal. Remove ring while being careful to hold the freewheel body halves together in order to prevent spilling the bearings. 6. Using a plastic or metal bowl, place over the freewheel to the spokes. Quickly flip the wheel 180 degrees and allow the outer body and bearings possibly the pawls fall into the bowl. Carefully lift wheel to see if any of these have stuck. Make a new video of what you see on the inside.
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The "clunkiness" can be caused by dirt, corrosion, broken pawl(s) or ball bearing(s). Flushing probably dislodged the "clunk" and converted it into a "lock."
There's no way to evaluate the cause with the freewheel assembled.
1. Remove the chain guard by removing the snap ring.
2. Remount the freewheel to the wheel with a tire inflated to approximately 15 psi.
3. Using two chain whips, unthread the two smallest sprockets (IIRC). The remaining three are splined and should slip off. However, the middle sprocket might also be threaded.
4. With the wheel facing you, position the two small holes at 3 and 9 o'clock. Having another person hold the wheel helps but this can be done solo. Using a hammer and punch, strike the 3 o'clock hole down towards the floor. It has reversed threads. Once it is lose you should be able to thread it off easily but sometimes the punch and hammer is needed to the end.
5. Before threading the retaining ring/outer bearing race off completely, flip wheel to horizontal. Remove ring while being careful to hold the freewheel body halves together in order to prevent spilling the bearings.
6. Using a plastic or metal bowl, place over the freewheel to the spokes. Quickly flip the wheel 180 degrees and allow the outer body and bearings possibly the pawls fall into the bowl. Carefully lift wheel to see if any of these have stuck.
Make a new video of what you see on the inside.