Happy w/ Ronstan
I've used a combination of Ronstan, Harken, and Schafer on replacement and mods. Thus far, I think Ronstan is the best value for the $$. There are good dealers on eBay which can beat WM's price day in/out. Garhauer's prices are hard to beat as well, I've just not wound up buying any Garhauer equipment that I can think of.If you are talking about blocks for the rudder or engine lift, those were apparently made by Mac and will require drilling out the rivet and replacing the sheave. I had no luck finding any blocks just like those from any manufacturer.