Problem with Modeling/Mag Knob

[specracer986]

I bought a used JTV69 that was advertised as in mint condition. It is, except there is a problem with switching from the magnetic pickups to the modeling, that the owner didn't disclose. If I take the knob off, I can switch back and forth fine. But with the knob on, it won't switch. I almost feel that the plastic piece that protrudes down from the bottom of the knob, is too long, stopping the switch from being compressed far enough. That's just a theory at this point. I wanted to see if anyone else has had this issue before I try doing any modifying.

[cruisinon2]

The shaft inside the knob is too short. Cut a small piece of cardboard and shove it in there. Usually takes care of the problem. Been going on since day one...3 cheers for quality control.

[CipherHost]

I've read others who placed something in the whole to take up a little space so the knob does not sink too low. 

 

Edit: crusinon2 beat me to it, and phrased it better too!

[specracer986]

Thanks. Sounds like my idea to shorten the plastic shaft that protrudes from the bottom of the knob would also work.

[Charlie_Watt]

I would not modify the knob.  Just put a bit of something in there to keep it from going too far on the shaft.  Easy solution.  Folks here have been doing that for ages because it is a common problem with the JTV.

[cruisinon2]

Thanks. Sounds like my idea to shorten the plastic shaft that protrudes from the bottom of the knob would also work.

Perhaps, but you'll be burning a lot of extra calories to get to the same place...and you can't "undo" what you're proposing, should you f#@$ it up. A little cardboard shim is a lot less permanent and easy to adjust, if need be.

[specracer986]

I agree. If a replacement knob was available, I'd be filing the bottom of the shaft on mine, now. But without a replacement knob available, the price of failure is too high. So, cardboard it is.

Just out of curiosity, if I had bought a new JTV, would it potentially have had the same problem?

[cruisinon2]

I agree. If a replacement knob was available, I'd be filing the bottom of the shaft on mine, now. But without a replacement knob available, the price of failure is too high. So, cardboard it is.

Just out of curiosity, if I had bought a new JTV, would it potentially have had the same problem?

It's a possibility. This is an old problem...and given that theses guitars tend to sit around for a while depending on where you buy it, "new" sometimes means "built 4 years ago".