Review on 🔧 Saris Trainer Clutch Tightening Knob by Frank Tyrance

I bought an old CycleOps trainer from a friend but it was missing the L-bolt. I bought a clutch handle (the trainer had a cam lever instead of a handle) and found that the handle was unthreaded. Completely smooth inside. I called Saris and they sent me a new pen for free. I really only needed the L-bolt as the cam arm works with the one I was given, but Saris no longer carries the L-bolt that connects to the cam arm (they are different lengths, although I'm not sure if that would be a problem). I've searched the internet but haven't really found anything that compares. Saris has good customer service, although $30 for an L-bolt (just the part I need) is a bit much. Any helpful suggestions on what to do with the unthreaded handle? Plus 4 stars for customer service, minus 1 star for defective product.