@Fryguy This is what I was referring to:
```ruby
irb(main):001 > class TestClass
irb(main):002?>   def self.service 
irb(main):003?>     @service
irb(main):004?>   end
irb(main):005?>   def self.service=(value)
irb(main):006?>     @service = value
irb(main):007?>   end
irb(main):008?> end
 => nil 
irb(main):009 > class SubClass < TestClass
irb(main):010?> end
 => nil 
irb(main):011 > TestClass.service = 21
 => 21 
irb(main):012 > TestClass.service 
 => 21 
irb(main):013 > SubClass.service
 => nil 
```