I still like my 125s though. 

Ken, the hydro linkage does not sit inside a tube. I believe you're looking at the steering column tube, which sits directly in front of the hydro control shaft and kinda blocks it. Might be best to pull the whole steering box and column to gain access to it.with what KMC posted must be that outter tube the shaft itself slides in... like a threaded sleve of some sorts. tractor isnt all that rusty.