If you upgrade the operator door on an ST-10 lathe built before September, 2013 with a new style door  (P/N 30-5704B, or 30-5706B with a parts catcher), you will need to modify the bulkhead to allow the new door to fit.
This procedure tells you how to modify the bulkhead.
Note: Parts catcher equipped doors are shown in the illustration.
- P/N 30-5704B No PCAT Door Assembly, ST-10 or 30-5076B PCAT Door Assembly, ST-10
- P/N 93-2114 Non-PCAT Door Liner/Felt Service Kit, ST-10 or 93-2115 PCAT Door Liner/Felt Service Kit, ST-10