The left side hydro on my walker has got on really bad, almost won't catch at all, have to pull lever all the back to get any movement, sounds real bad like grinding at times. Opend up the Allen key check oil level spot, have some metal shavings on the magnetic screw. Obviously hydro pump is on last leg on that side. Went to dealer today, they wanted $800 just for part. Curious if anyone knows where online I can buy a hydro for cheaper? Looked but couldn't find anything.