Set screw size for the gear select on inside of G0704

[travis_cnc]

Can anyone tell me what size the hex set screw size is supposed to be on the inside of the G0704 gear select knob?
I stripped the gears on the inside and can't seem to break it free.

What seems to fit at least partially is a 2.5mm hex. Is that correct?
It seems to fit tight but slips when pressure is put on it. I can't break it loose.

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[travis_cnc]

Here's a picture of the part.




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[travis_cnc]

The manual says it's a 5mm set screw although it definitely seems to be a 2.5mm. I can't get it to break free and it slips when I add torque to it.
Does it actually need to be removed in order to replace the stripped gear? Can I just pull the shaft?

[109jb]

5mm is the thread diameter, which you are correct should use a 2.5mm allen wrench. If the hex is stripped then use an ez-out to remove it and replace the screw.

[travis_cnc]

Thank you for the reply. Gives me an excuse to buy more tools since I don't have any ezouts at this time.

My question just goes to show my ignorance of all of this.
But we all start from somewhere. I am more of a software guy so expanding into hardware is interesting and fun.

[coherent]

Get some Liquid Wrench or even better if you can find it Kroil or something similar and spray it and let it sit a while. Overnight is best.. and then try it again. The moisture in the china factories and on the ships and docks aren't nice for unprotected parts to begin with, much less if you've had it a while.

You could also try cleaning up the inside well and then heating up the metal part surrounding the set screw with a butane torch and then trying it. There may also be a thread lock on it which the heat may soften.
Careful. If you've already used some, because some of those rust loosening lubes etc are flammable.

[travis_cnc]

I just wanted to say thanks to everyone for the suggestions.
Unfortunately I haven't had time to try any of them at this time but I am hoping to tackle the issue this weekend.