I just purchased a Chandler 67 GK373. Had it out in the shop to do some maintenance. I have the directions for use but it doesn’t tell you where to oil the thing. This is my first industrial. I plan on using it to make bags and wallets. It’s a walking foot machine and I love it. I’m just afraid to use it much right now until I know how to oil it and maintain it myself. Been sewing for 55 years. Started off with an old treadle making all my clothes, gowns, etc. Any help or where to find some reference material would be so helpful. How often to oil it also. Thanks in advance.