Get in touch with Code 3
http://www.code3pse.com/Code3/sas_technicalsupport/ OR a dealer close to you
http://www.code3pse.com/Code3/sas_sales/ who sells/installs Code 3 products...another possibility would be feE-BAY ...I have noticed many good, used light bar parts and pieces there....I believe the MX 7000 would have the same gear set up as well.
Before you go pulling rotators, be sure and check to see if there is any adjustments that can be made to the gears...I am not sure on LP 6000 ,but I have seen where it is possible to further engage/disengage the gears via an adjustment mechanism elsewhere.
Parts list link
http://www.code3pse.com/public/media/C3 ... t_1210.pdf
Customer service parts dept.
http://www.code3pse.com/Code3/Parts_Replacement/