I've never had much luck even with tapered reamers as the solder/braze always seems to let loose. I have used the "JB-Weld method" outlined in a thread here with good results...
2846 will not work as this particular case is specifically for movements with the stem height of the 2824. If you want low-beat then you'll need a 2783 as previously mentioned...
Yes, it's definitely getting slower and the tracking is now the pits... A registered package from WE tracked to some sorting center in NY then nothing until it was delivered about a week later...