With the 15 year old TK I use regularly the weight of a 4 lb. lens on the front standard won't cause that standard to fall once the lock is released. All the sliding motions of both front and rear standards have remained surprisingly consistent and firm but easy. The 15 year old has never been serviced, and I don't treat my gear very kindly. I'm more interested in images than equipment.
Nate Potter, Austin TX.
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