Hello,
I have a question about the control setup on my WH 300 Special. In the instructions Tom states that you should not use ball links. I have purchased SWB arms for my Hitech servos and if I use the supplied Sullivan Gold clevis then there will be slop in the controls since the gold clevis does not fit snug in the SWB arms. Given this ?I was going to use some ball links with 4/40 bolts. Is there a problem with this. If so, what clevis will work with the SWB arms and not have excessive play?
Thanks,
Brian

For what it is worth I used Dubro heavy duty ball links on my servo arms (same as yours) and have had no failures or problems after 32 flights there are those snap on type ball links which is what I thought Tom was referring too as all the giant scale flyers at my field use ball links on their planes. Give it a while and I am sure you will get more info on this Good Luck

Tom's recommendation not to use ball links is aimed at those that would elect to use plastic or nylon servo arms on the servos. Using the SWB/AirWild/JR/GSP arms pretty much eliminates the fear of twisted and broken servo arms. The nylon and plastic arms will eventually fail from the side loading of ball links, and are known to flex considerably, permitting less than positive control and/or flutter.

There is no problem at all using ball links on the aluminum arms, and using a 4-40 screw is the correct method of attachment. It doesn't hurt any to install a nut under the arm for a safety back up. It also won't bother anything if you install a 4-40 flat washer between the top of the ball and the head of the screw for a safety back up on applications where the ball is not already captured in a clevis assembly, such as a servo arm.

The use of ball links in a proper manner provides extremely stong linkages and minimum binding when installed and set up properly. The thing to remember is to use the right components and set it up correctly.

What silversurfer said. Ball links with aluminum arms is OK.

TF