Charvel Bass guitar 1990

I recently purchased a

 

I purchased a 1990 Charvel Eliminator Bass ,I need to adjust the bow on the neck .I took the cover off and there is a rod but the square nut is embedded into the wood ,no way to adjust .I pulled the neck to check if it had a heel adjust but nope .Does anyone have any info .Thanks for any help

 

It was a forward bow and I found a nut that tightened it right down ,all good now . I will try and find the correct one so I can use a socket instead of a pair on needles nose pliers ,Thank You