manifold heat control valve

Can you A) easily change from one style to another? From the older square weight to the newer round weight, for example? Is it as easy as taking off one and installing another? Or do you have to drill/weld something?
And can you B) lock it into position where you never heat the intake, if you live in Southern California or Florida, for example, and it never gets snow? That would be the opposite of the post/stop, right? I know you can wire it to the stop so that it cant move, but how do you wire it away from the stop? Just take off the spring and hope it doesnt move while driving?
No, the early stamped steel weight is a clamp-on type.....the round cast weight is a press-on and can break if you're not carefull. Yes, you can "wire" it open if you think you need to. Unless you make a solid gasket plate dividing the exhaust from the intake manifold, it will still heat the intake. When the heat riser is in the cold position, it just heats it more.