[TCML] Opening an inspection port on a pole pig

[David Speck <dave@xxxxxxxxxxxxxxxx>]

List:

I recently purchased a Westinghouse pig with a tap changer switch 
inside.  There is no external handle for it.

It came set for the lowest voltage, and, naturally, I'd like to switch 
it up to the highest voltage.  ;o)

There is an oval access cover in the lid measuring perhaps 4 x 8", with 
a flat thumb screw in the center.  I figure this is an access to allow 
oil filling, and perhaps tap changing without pulling the whole thing 
out of the tank. 

However, the unit has been freshly painted over, and the thumb screw 
doesn't turn (at least not easily). 


Before I go and break something, can anyone tell me the proper method to 
open the inspection cover? 

Does the thumb screw drive a quarter turn latch mechanism, or does one 
unscrew it completely to get the access cover off, or is the cover plate 
just held in place by a spring clip?  I'm betting on the first design, 
but thought I'd ask before applying the ChanneLocks to it and likely 
breaking something. 

Not that I plan to do it anytime soon, but out of curiosity, how does 
one pull the core out of the tank?  I assume that it all hangs from the 
cover, as there is a robust lifting ring in the center of the lid.  I 
don't know if there is anything that holds the cover to the main body of 
the tank, or if it just relies on gravity to keep it together. 

Thanks in advance.

Dave
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