IN 2009, Glenn Haworth dared to attempt the improbable - re-stringing 30 guitars in one hour.
The Kiama Downs resident achieved this feat and is still the Guinness World Record holder for the most guitar strings changed in 60 minutes.
Now, the 29-year-old is attempting a similar feat in order to raise funds for Make-A-Wish Australia.
On October 4 and 5, Mr Haworth aims to break the Guinness World Record for "longest marathon playing ukulele".
Mr Haworth, general manager and director of Haworth's Shellharbour Music Centre and Drum Room at Albion Park Rail, will need to play the instrument for more than 24 hours straight.
"I think it's been awhile since I've done anything crazy or silly," he said.
"I wanted to do something for Make-A-Wish, [because] we support them with the school tours we do."
Mr Haworth said he was not overly experienced in playing the instrument, but had been building up his chops gradually.
"I haven't even owned one before," he said.
"When customers came into the store, I've always been able to play a three-chord song on one, just to impress them. I know about four chords now."
His preparation has included learning about 100 songs to meet the Guinness guidelines.
"I need to play a four-hour set and learn a fair bit of material," he said.
"You can't play the same song within four hours.
"Every song has to be at least two minutes long, and a maximum 30-second break between songs.
"I get a five-minute break every hour."
His tenure playing AFL for the Kiama Power club would help his fitness and stamina, he said.
"I'm going to try and learn all the songs off by heart, so I can walk around or jump up and down on a trampoline.
"The ukulele has nylon strings, and only four of them, so it's less demanding on your fingers."
Mr Haworth hopes to raise $50,000 from donations and an auction.
The event will take place at Haworth's New Music Centre Wollongong. Donations can be made at give.everydayhero.com/au/glennhaworth.