I will be attempting my 1st balance staff replacement on an 1890 Columbus Model-3, 11 Jewel movement. This is it here: https://pocketwatchdatabase.com/search/result/columbus-watch-co/173818 I will be using my K & D Inverto Delux, No.18 Staking Set. I have watched every video and read everything I could find over the last several months and have a decent idea of what is involved. I have so far successfully repaired several non working pocket watches which are all running fine now, with the exception of one 1910 Waltham Grade-625, Model-1908, 16s Pocket Watch that losses 2 minutes each day, but I will re-visit that one soon. I have been unable to find a parts & materials catalog for Columbus. If anyone here has a pdf that would be great! I have some questions that I hope this wonderful community can help me with. For starters, which staff do I need and are they available? Is this a friction fit or riveted staff? Let me know if you need me to remove the staff and take some close-up photos. Can one tell the difference between friction fit and riveted staffs by looking at them? Can one tell the difference between single and double roller staffs by looking at them? Also. Is this a good movement to start balance staff work on? If not, I have other movements that need staffs including: 1908 Waltham Riverside Grade Model-1894, 12s, 19j 1916 Illinois - Grade-69, Model-6, 18s, 17j 1889 Rockford Grade-68, Model-8, 18s, 11j 1879-80 Waltham Model-1877, Grade-Broadway, 18S, 7J 1896 Waltham - Model-1890, Grade-Y, 6s, 7j 1952 Bulova 17AH and some other higher grade watches that I will staff after getting some practice. I have been learning so much and having lots of fun in the process. I really love this hobby. balance staff Thank you in advance for your input and advice. Have a great day!