Making a Thread Mount Back Plate for a 5-inch chuck + A useful modification, K12-125, K11-125

Tool Post Drill:    • Tool Post Drill - Easy to Build and Versat...   Gear Indexer:    • Simple Indexing on a Metal Lathe   Chuck (same chuck on Amazon, Vevor is out of stock): https://amzn.to/3VjJYD0