I've owned Swaro spotters for almost 20 years and have settled on a tripod/head that I really really like for stationary observation and for the money: Manfrotto 055Xprob tripod (aluminum; $250) and the mvh502ah (a fluid video head that is superb for the application; $200). This setup is very steady/stable and works well for an iphone for digiscoping with a phoneskope case. I used to have the original balance rail for more support for the application and recently replaced it with the "balance rail ii" which has an ACRA Swiss base. This can be adapted to the mvh502ah base; however I stumbled upon this piece of kit by KES Kirk Enterprise Solutions, a camera shop in Indiana (https://kirkphoto.com/) which replaces the entire base of the mvh502ah with a beautifully machined alloy replacement part that has an ACRA Swiss plate on it. I'm very happy with this setup which allows the balance rail ii to be directly attached to the tripod head. It's a pricey but superb piece of kit. Just thought some of you might want to know this exists.