Congrats! A John Goodman seal kit might be in order. Lets hope the thing is working tip top. If not, I know Russ Sisco can do a great CLA...
No affinity to Russ, just'a happy customer, had a CLA from him for my Lynx and it was perfect
Last, the below guy sure knows his Electro, some good advice here:
Be careful if you need to do work, sometimes it is much more reasonable to send a camera off for a CLA than try to DIY....
Yashicas are great cameras! Run'a ton a film thru it!!
Great battery mod! Sure Polygot and the other good mod'rs round here are happy to see your handy work.