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I have used a ratchet strap hooked over a rudder pedal, around the stick and down to the rudder pedal on the other side.
Left side shoulder harness.
I use the seat belts , with the rudder hooked to the nose wheel, it has never moved ...BOB
Dave, is this the ebay vendor you bought your control lock from?
Almost like Daves setup, just use a bungee cord hooked on the left and right rudder pedal, then placed over the Y stick.
Works well, is super simple.
I noticed that there are two different sizes for the control locks.
Which one did you choose?
I have a 601XLB
I sent him a message through ebay asking which to order, and he said to take the dimensions from the two drawings to the airplane and see which one works best on the 601XL. He claims the reason the Zodiac isn't listed for either size is that when they were creating the lists, no Zodiacs were available for him to measure.
I made some cardboard templates using the dimensions on the drawings, and plan to take them to the hangar this weekend to see which one fits best. I'll post the results and photos here.
EDIT: Here's his reply:
I measured the dimension from the center of the control stick grip to the centerline of the control panel bottom flange, and with the elevator in the neutral position (in line with the horizontal stabilizer) it's 8".
That dimension on the long control lock is 9-3/4" and on the short control lock it's 6-3/4", so neither would be an ideal fit for the CH601XL. With the long control lock, the stick is pressing into the seat cushion and the elevator is way up. With the short control lock, the elevator is down.