While a large range of parts are still currently available many are not, and replacement of something often means 'making it', he says.
Club member Denis Burr says he has been a member for about 20 years, having restored four to seven Farmall tractors.
He says he enjoys it as it is preserving both history and fellowship.
Denis says at this event the public will be able to get close and personal to the machinery, hop on to the tractors and have a chat to the owners to find out why the machines were made.
People will also get to see tractors and machines operate.
Various demonstrations will be on show such as tractor pulling, haymaking and ploughing, he says.
For the children there will be a mini digger for them to play on, tractor rides supervised by adults and activities run by Mamaku School.
Mamaku School will also be providing refreshments.
The Mamaku volunteer fire brigade use the day to demonstrate their skills and raise money for additional equipment which is always needed in their role responding to life's emergencies in a rural community.
Denis says he will be taking along some of his restored tractors to the event.
"It's an opportunity for me to show off my toys."
He says youth often show a reasonable amount of interest at the working day in what changes there were in the machines from then to now - "and with probably more changes to come".
The annual working day will go ahead regardless of the weather, he says.
Gates open at 10am with an entry cost of $10 per adult.
Details:
* What: Rotorua Tractor and Machinery Club's annual working day
* Where: Corner of SH 5 and Oturoa Rd
* When: Sunday February 26, 10am
* Cost: $10 per adult