In my experience , if you need a " favor " its best to contact that person PRIOR to rubbishing their product in a public forum.
Sometimes a malfunction is user error and its sad to blame a product when this occurs.

So just as a general tip if you ever have a problem with a product , no matter what it is , its wise to give the sales point or distributor the opportunity to fix it , if indeed its a warranty related issue prior to making them and their product look bad. And by all means if they dont give you the time of day , then go and tell the world.

Throwing a gudgeon pin retaining clip is not unique to Go engines , it indeed happens on any nitro engine.

Regards MM