principia

Many thanks for the comments. I happened to be passing FLO in Exeter this afternoon and popped in with the SA. A very helpful SteveB swapped the wedge out straightaway. The replacement is much more positive in operation - working exactly as Dave describes above. Now down to business! Richard

I bought the SA recently and had a first chance to use it last night. I noticed that the altitude lock on the wedge does not seem to lock properly and I'm worried about over-tightening the lock in case of damage to the plastic lever. It's as if more shims are needed to make the slot a tighter fit. At the moment the lock doesn't seem to be strong enough to 'close' the supports to clamp tightly. There is also a lot of backlash in the altitude control. I'm wondering whether all the SAs are like this and I just need to get over it, or is mine faulty? Thanks Richard