Stellarvue M7 Mount Alt Azimuth Dual Mount Head The M7 is a solid and smooth Isostatic mount providing a substantial improvement over the smaller, lighter dual mount units on the market. The ergonomics, bearings, load capacity and smoothness of the M7 is unsurpassed. The new M7 now has a 35 pound capacity with adjustment and locking ability in both azimuth and altitude. This will make it easy when you have changing loads and you want to observe with different sized telescopes simultaneously. Do not compare this mount with smaller, lighter units. This massive alt azimuth mount has a 6" azimuth bearing surface, oversized Teflon and stainless roller bearings on each axis. Adjust tension on both axis and you simply glide through the sky smoothly and stop completely when you arrive at the object. This mount must be experienced to be appreciated. No more pushing a mount that sticks or shoots past the object. Glide effortlessly from one object to the next. This latest version has independent adjustment locks allowing you to vary the degree of tension even better. This mount is so smooth that slow motion controls are redundant. The Stableglide "disappears" when you use it. Counterweights and precise balancing is not necessary unless you are using a single, heavy telescope. They are available separately.