Hi, IMO it's best not to disassemble these speed controls unless you really know them well or want a huge headache trying to get it back together again. What I do is use some very long q tips soaked in alcohol and work that into and around the speed shift parts. I try to remove as much of the old grease as possible. Then using the q tips I work in fresh grease I like to use a grease called super lube in them. It seems to be able to loosen the parts up better then lithium grease does. As I work the fresh grease into the parts, I gently work the shift lever through the entire range of motion. Be very careful at first you don't want to break the the shift lever it self. I have done this successfully on a bunch of dual turntables. But on some I did have it take the shift lever a part becsuse the lever was stuck so bad. If you need to take it a part make sure you take a lot of pictures before you do so. If you can't get super lube then use a good quality lithium grease. I hope this helps and good luck.