Pot compatability and replacement questions...

Hi all,
I'm looking for options for replacement of the push/pull stacked volume/pan control on my '87 Streamer ;
which is now bassically unplayable as it is so scratchy when pulled up and doesn't work at all when pushed in. De-Oxit has not done much after a few treatments.
(sorry for phone quality photos)
I don't think that it's an original part to the bass and I think I may I've found a MEC replacement online (for over $90) however I think my wife would prefer I spend less than that...
I'm a newb to this repair end of things and am not sure if any different model would be compatible with the existing MEC pots and EMG pickups or is an entire new wiring harness recommended?
Also not sure of the rating I need to look for (500K, 25K etc) as its not visible (to me) on this pot; the bass, mids and treble pots on this bass appear to have 100K? stamped on them...
Any guidance is greatly appreciated...
Cheers!

 

A little further digging and it appears it is a 'B500K concentric triple deck volume/blend pot'...sooo, will any make of 500K triple deck Vol/Blend pot work with the existing MEC pots or would it be easier and cheaper to change out all the pots/wiring at once with a new solderless set?
Just looking for some other perspectives or angles of thought on this...
Cheers!

 

I think I have narrowed it down...

Warwick Part $122.50 --> http://www.ebay.com/itm/NEW-GENUINE-WARWICK-PUSH-PULL-VOLUME-PAN-POT-STREAMER-THUMB-NT-BASS-GUITAR-PART/361166207296?_trksid=p2047675.c100011.m1850&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20140602152332&meid=df2e24b6c5024420b15495b2a57d596d&pid=100011&prg=20140602152332&rk=3&rkt=10&sd=141505543512

'Alpha' Part $8.49 -->http://www.guitarelectronics.com/product/CPP500/Alpha-500K-Audio-Pot-w-Push-Pull-Switch.html

A bit of price difference and I'm guessing maybe quality too...sometimes it seems you just can't really skimp to save a buck...

 

Thanks for the reply.
Yes, the more I look the more it seems that there is but one replacement option, now I guess it's time to try to find the least expensive source...

 

So, I've found it a couple of places for about $75(Can) + shipping...i thought before I pull the trigger on this part I should at least ask...
{1} any leads on a less expensive source?
{2} is it advisable to change only the one pot vs changing the entire wiring assembly?
{3} is there a chance it could be something else like the EQ or a bad P'up?
Obviously I don't want to spend money needlessly.
Any guidance is greatly appreciated...
Cheers!

 

Well, I took the bass over to our jam last night to get some more help to try and figure out some stuff or narrow down some possibilities...still scratchy in the 'up' position (the kind of scratchy I have fixed with DeOxit spray on other amp pots before but not this one); in the 'in' position there is only sporadic sound when strings are plucked and it is all heavy buzzy!
So after this latest bit of visual and sonic information gathering and after it being suggested by others; I am now thinking it may be the preamp???
Sound plausible? I've been informed that "When pushed in, the electronics are active."

This seems like a pretty good deal & more importantly a pretty straight forward fix...
http://www.emgpickups.com/accessorie...stem.html#info

Unless I'm missing something (I'm prone to that btw) if I changed that out I can't imagine still having any issue and if I did it would have to be with the EMG pick ups (new in 2006?) but I dont get that impression...
Am I on the right track?
Solderless connections OK?
I wish taking it to a tech was less an issue and that I knew more but hey it's all a learning process...
Thanks for any help you can provide...
Cheers!