GroupJ Engineering here -

We specialize in bicycle break away couplings and motorsport design and restoration.

Products include Rally Play - iOS based rally instrumentation; JBob bicycle frame couplings; racing kart paddle shifters, Porsche 356 twin plug heads and 911 fan conversions, LeGrand Registry

visit us at www.GroupJ.net

Hi groupj - welcome to HomemadeTools.net :welcome:

Interesting product! I had never heard of bicycle break away couplings. Do you guys use any homemade tools in your manufacturing process?