Stripping plastic spools

[RAW75]

I Frankenstein together a temper and Doomsday using the temporary frame as the base with the added extra power from the motor and tranny from the Doomsday I have been stripping my Front plastic spool in the differential I need to come up with a metal replacement otherwise when it keeps tripping the plastic ones is there any company, or website did I can order a brass or aluminum upgrade for the school I'm not that good on the computer and having a heck of a time trying a set of replacement spools?

 

[Trailcat66]

After a little research I found Redcat 680010 Connect Box (W/Gear38T). All metal $15.