Cosine indicators for 34mm tube.

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I've been looking for a reasonable Cosine indicator to put on a 34 mm scope tube / or attach to the rail. The only ones I see are either cheap Chinese poop, and I don't want to put any of my money towards the CCP, or they are a couple of hundred quid + for one made by high end manufacturers. I don't buy cheap, but neither do I want to fork out £££'s for something I'll only use a couple of times at most - especially for something that not exactly hi-tec, as its only a small pendulum when you come right down to it.

Any suggestions?

Cheers all.