I'm debating the pros and cons of making a decent, solid lock system to secure the rudder, when on a swing mooring. I have just replaced the rudder bearings and I'm keen to ensure they stay nice and tight. The bearing are Jeffa spherical with roller bearing elements, on a stainless shaft. My boat has the rudder stock protruding from the deck, under a lift up hatch. The top of the shaft terminates in a 25mm milled square. The plan is to use 25 x 6 flat to form square socket, 4 pieces tig welded together, then attaching the top end of this to stainless cross head, that nestles into the hatch channels. So it would be a quick lift off device, but solid to avoid repeated movement of the entire steering gear.
Is it a good idea to lock the rudder, to reduce movement?
Has anyone else bothered to do something similar with success, just curious?

cheers Richard