My Exiss (Universal Trailer) has these attachments for breast and butt bars:
211006_9185 by Wendy, on Flickr
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?