Wilcome Tunnelly wanted Golfimbul's skull to be kept in the Mathom-house where it could be near Bullroarer's club, but Keeper Foxtail has lent the famous club to Bounder Primstone.
'Have you met Bounder Primstone? Runs the Watch-house up at Brockenborings. He came by a few hours ago and asked to borrow the Bullroarer's club. Normally, I don't lend things out, since I like folk to visit the Mathom-house if they're interested in seeing something, but Primstone is very dependable.
'Some of the young hobbits up in Brockenborings have expressed an interest in the Battle of Greenfields, apparently, and Primstone wanted to show them the club Bullroarer used to knock off the head of Golfimbul.
'If you think it should be brought back to keep Golfimbul's skull company, you could mention it to him at the Watch-house in Brockenborings.'
Bounder Primstone is at the Watch-house in Brockenborings, far to the north-east of Michel Delving.
You brought the old skull from the Scary quarry to the Mathom-house in Michel Delving, only to discover that Keeper Foxtail has lent Bullroarer's Club to Bounder Primstone. Brombard Foxtail suggested you should retrieve the club, if it was deemed important to keep the two items together.
Ranger Halros camps on the Greenfields, east of Brockenborings, at the end of the stone wall.
Believing that Bullroarer's club will enable him to scare the goblins out of the Shire, Bounder Primstone is preparing to journey to the goblin encampment which you found. He told you not to come with him, but to tell Halros that Primstone will soon have dealt with the goblins.