Best pot for Nak PA7MKII

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I'm repairing/rebuliding this NAK PA7MKII. This has been a difficult repair so far with some very unusual failures. The bias pot is very flaky and needs replacement. It's a 1k pot. I heard there are better pots than factory for this. I don't really want to go with a huge rotary pot that has to be custom mounted but would like to stay close in size to original. Any reccomendations?
Regarding unusal failures-In addition to shorted transistors I had a couple of partially shorted resistors-(not open) and a film cap that was breaking down under load. I may also need dc ofset pot but I'ts not even in service manual but just has a 51k resistor where pot was. Not sure if mine is earlier or later version(Mine has the DC ofset pot).
 
Pic of Pot

Here's pic of both pots. Looks like they are both 1K.
 

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