Help! Does someone know this RF circuit tuning kit?

When do RF matching, we have to try many values for the passive components such as capacitors and inductors to find the best performance. Sometimes my boards will be burned black with too many times soldering and resoldering. I learn from a friend that there exists a conveneine kit. It looks likes a nipple with a isolated stem and two metal contaction in the one end. A set of kits will come with a set of capacitors or inductors with the same equivelant values each by each. When tuning, we can push and connect the kit on the circuit to act as a related capacitor or inductor without soldering. We need solder only once after the best value was found. It is fast and conveneince. Did someone use it and can tell me where to buy? or does someone know the exact name? thx.
Regards,

kayaoo

Perhaps you are looking for something like ATC Tunning Stick Kits.... Only caps, not inductors

**broken link removed**

I hope it helps