This may be off topic,but I wondered if anyone had ever used a bug key like the vibroplex lightning and added weights to slow it down.

:This may be off topic,but I wondered if anyone had ever used a bug key like the vibroplex lightning and added weights to slow it down.
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Yes, you can. I used to do that with a Vibroplex. Another thought is clipping an extention onto the arm and adding a weight there. It should oscillate slower like moving a clock's pendulum weight down. You'll just have to experiment a bit and see what works best. Mods may have limited results though.
Steve