My Exiss (Universal Trailer) has these attachments for breast and butt bars:
One handed operation is nice, just drop it in! But… they are awfully noisy, the pin rattles and bounces in the holder.
Elsethread someone mentioned applying a roll of vetwrap to quiet noisy attachments. Is that advisable here, just wrap the pin (obviously not so much that it doesn’t fit in the channel)?
Any other ideas?