[quote name='Big_Stu' timestamp='1343748406' post='1754578']
Before you went doing anything that can't be undone try this route [url="http://basschat.co.uk/topic/49897-how-to-shim-a-neck/"]http://basschat.co.u...to-shim-a-neck/[/url]
If the action is as high as you say (what is the gap measurement between the bottom of your two E strings and the 12th fret for example?) I would doubt it's been caused entirely by such a fine gap in your scarf joint. Hard to tell from your pic, at face value I'd agree it could be just shrinkage.
Try detuning completely then study the "gap" as you retune, does it become more obvious - can you see it widen?
What you could try is some of the Evostik wood glue (in the green bottle) - not the quick drying one. Water it down [i]slightly[/i] so that it flows better and paint it into the crack with a paintbrush (when the guitar is tuned up & the gap is open). Get as much of it in there as you can, try blowing it in there as hard as you can, until no more will go in. Then detune, push teh strings to the sides & clamp it closed between two pieces of soft wood. Leave it at least 48 hours, more preferably. If it doesn't work you only lost the price of the glue.
What "Dad3353" describes is the usual way of fixing a broken scarf, many SGs have suffered that fate. It works, but it ain't pretty - and a real luthier will charge for it.
If Mighty Mite don't do a straight retro-fit replacement you'd still be paying someone to alter the heel or the pocket - or both - to fit them together. MM necks are very good & priced accordingly. There's a bass like yours on Ebay just now at £100, not much more than a MM neck alone, for a donor neck & lots of spare parts.
PS. Might be asking the obvious - but have you asked Washburn if they've heard of this before - or if they carry spare necks for them? I've only approached them once, but they were helpful.
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Upon closer inspection, the neck has started warping? a little. The neck starts to bow/lift up from the 5th fret to the headstock. Could that be due to shrinkage?
I'm guessing that I just need a new neck (unfortunate). I saw that on ebay but, being a university student, it is still a bit too rich for my blood. I'm in talks with a local luthier about making a replacement neck. if that's too much, it might be time to switch to a fender clone... (sad face). I love this cheap little bass and wish that it would play right. As it is, I have to hammer it and everything comes out sounding like funk/punk! Washburn isn't helping that much. They told me to go to Warmoth, but, as I understand it, the heel/pocket is too different.