Gear replacement question

[kcamrac]

I need to replace a gear located in one of the long guides (defense guide). What is the process to get the old gear out?  I am also experiencing an issue that I cannot loosen the collar screws.  Does anyone have any advice how to loosen those screws when they are stuck?  I do not want to strip them.


Thank you in advance 

[peter2626]

try spraying some pb blaster or some other lubricant...let it sit over night...also sometimes its better to tighten a little before trying to loosen....if all else fails heating from a small propane torch directly on the screws may work.... if you strip them you will have to drill them out with a small drill bit...good luck