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The MMQ at Bisley has no buffer but uses steel geared servos.
The prototypes had the flags held in with elastic bands in angle but now use ally box so the flags just drop in.
Introducing a buffer will create a weak link.

I don't think a .22 punching through polycarbonate would create too much torque back to the motor anyway. Might look at servo savers if they're cheap enough

Aluminium Warehouse http://www.aluminiumwarehouse.co.uk do half inch square aluminium tube (12.7 mm x 12.7 mm x 1.6256 mm) for a sensible price with a finished internal dimension of 9,5mm. Postage is quite high however I order from the quite often so happy to add something to the order and can probably post them out cut to length for a lot less than AW.

Good idea David. I'll check what size batons b&q do for ease

hows this progressing?? :)

Only just back to work and back on my feet, should get somewhere this week :-)

good to hear it!

OK, knocked together a test bench with what I had laying around. Connected one servo and one flag to make sure it was doing what I expected.
That's on max speed for that particular servo, I think it's fast enough, could be quicker if the linkage is changed but I can't get my head around the physics of that

That is a fine start.

Do you think it's quick enough David? I was going to use the micro servo but it's really twitchy and seems to hold the interrupt open