M84 Scope Help Needed, No Clicks

[1903nm]

My son mentioned last night he might want to shoot in the vintage sniper match this year at Camp Butner. So, I pulled out our DCM M1-D and was just toying with the elevation knob and realized that there are no feel to raising or lowereing the elevation knob like I expected to feel. I knew of another M84 and that scope was correct so I know I have a problem. Does anyone know if there is an easy fix for this or is there someone I might need to send it to?
Thanks so much!

[1mark]

Check and see if the knob screws are tight. If they are loose the knobs will just turn. Also do the knobs hit the stop or just continue to turn?

[Twinson]

Might need to replace your detent. Easy fix. Jim

http://i439.photobucket.com/albums/qq119/TwinsonFarm/m84_zps1fc35a9f.jpg