My Beike gimbal head wasn't quite as bad as Larry's (while he had it) but it was still quite stiff, so following Larry's instructions I took mine apart. The washer wasn't the culprit for me but the lock knob was frozen on with some sort of lock tight compound and backing it off 1/2 turn (max allowed) still was not enough to achieve free movement. I cleaned off the sticky grease on the pivot parts, re-lubed them with "Dura-Lube", which I believe has Teflon and re-assembled the head back together again. Now I was able to back off the lock knob more than 1/2 turn or more to achieve less-effort pivot of the swing arm but this raises another problem.
The lock knob serves dual purpose; one of locking or loosening the swing arm and to keep the swing arm assembly from sliding out from the frame. When I mounted a 300/2.8 lens on this gimbal head, loosening the lock knob to get less-effort pivoting movement also cause the head to start slipping out of the frame and over time, it slips out enough that the pivoting arm won't maintain horizontal level. I'd end up tightening the lock knob a little more at the cost of increased resistance to swing movement, long story short, I ended up spending more time fiddling with the gimbal head than taking pictures.
I solved this problem by adding a piece of compression spring on the lock knob as shown in the pictures below:
This shows how the pivot arm assembly would fit inside the frame.
This shows the piece of a compression spring and another washer adjacent to the lock knob.
The compression spring maintains enough tension to keep the swing arm assembly from slipping out while loosening the lock knob to decrease the friction for easier swing movements.
The compression spring that I used is not by choice. I ended up buying a 2 inch long compression spring and cutting off about 1/4 inch long coil with a Dremel metal cutting disk for the gimbal head. I wanted to use a conical compression spring but for the life of me, I could not find a supplier in Canada. I managed to find the ideal sized one at Grainger:
GRAINGER APPROVED VENDOR Compress Spring, Conical, 302 SS, 1/2x0.720 - Compression and Die Springs - 1NDG7|1NDG7 - Grainger Industrial Supply, Acklands-Grainger, the Canadian subsidiary don't even list it in their catalog and none of the fastener dealers I deal with carry any conical compression springs.
I am calling out to any American forum member reading this and thinking of making the same modification, if you could buy another spring from Grainger, drop it in a bubble envelope and mail it to me, I would be very grateful and willing to pay for the spring, the shipping and a small fee for your troubles.
Thanks,