Hi, in case this happens to you, a Top Tip.
My Pomp freewheel stopped engaging on the way to work this morning. I presumed the pawls were stuck – it's not new (ahem) and it was -3C when I left the house 5 miles earlier. Also the bike had sat outside all night – very unusual but maybe a factor. 5 miles to the train or 5 miles home so I was a bit fed up.
So, I lay it on it's side, span the wheel as fast as I could the "right" way and poured oil on the side-plate of the freewheel. Idea being that the oil is drawn into the freewheel body and flushes/frees the pawls. It worked, took about 1 minute of spinning and oiling. Straight up the climb out the back of East Linton, quite a grind if you don't know it, and no problem.
I only had Pedros chain lube with me so a bit thick but it's done the job.
Cheers, al.