Just finished building a treadle hammer, in-line(roll blade wheels) Clay Spencer design.the plans were purchased from ABANA. The last piece I assembled was a adjustable turnbuckle assembling. Upon operating the treadle hammer it appears to me that the turnbuckle assembly is too long??? Having the turnbuckle assembly at the shortest point and the foot treadle touching the floor there is 7 inches between top and bottom anvil. Rechecked measurements .. Swivel, anchor points and linked arms , found no drastic errors,, maybe 1/16th or 1/8th on one or two measurements. Also another thing that makes me think that turnbuckle linkages to long, returns up and hits the top assembly with considerable force if you let it "freewheel" to the top position The copyright date on my plan since 1998. Any comments or recommendations much appreciated.. Thanks in advance