Incredibly, Seamus managed to design and develop the machine in time for last year's show, held in August.
"The paint wasn't even dry on it coming to Tullamore," remembers Seamus with a grin.
The inventions competition and the subsequent Ploughing Championships provided Seamus with valuable market research as he spoke to those interested in his log-shear.
"I found people wanted a dual-purpose machine that would both split and cut timber for firewood," he added.
"They also wanted the machine to be a lot bigger so it could cut bigger diameter logs."
Following the feedback, Seamus has developed a new dual purpose log-shear and splitter. It comes with two sets of tools, and newly designed shear and splitter devices.
"It's all the one machine. It splits with one set of tools and shears with another.
"It's just a matter of changing the tools to convert from one job to another," Seamus explained.
"It only takes about 10 minutes to change over from one to the other."
Seamus has designed his splitter to be capable of splitting logs on their sides, too.
"As a splitter, it can't be beaten," he declared.
The new shear jaws can also handle larger diameter logs.
"Last year's machine would shear logs up to 94mm in diameter. This year's machine will handle diameters of up to 163mm," claimed Seamus.
And he has redesigned the shear blades.
"Durability of the blades was a huge issue," said Seamus.
"I have that solved now by using bigger and better materials. Bascially, it's a much higher grade of steel compared to the first machine."
The original profile of the shear's cutting edge was manufactured by hand; now it is 'dished' on a lathe which Seamus says gives it strength throughout.
He likens the design of the cutting edge to that of an axe head.
"But, because they are a different radius, it enables them to grip the timber and be cutting at all times, rather than trying to cut with two straight blades," he said.
As a result, the log-shear works effortlessly.
Two hydraulic rams provide approximately eight tonnes of force, and on the day of my visit, the cutting action never slowed down.
With his foot on the operating pedal on one side of the machine, Seamus fed logs through the cleverly designed guarding system, which keeps body parts away from the shears.
Seamus has also designed an electrical control system, using relays, proximity switches, a foot-operated switch and electrohydraulic valves, which moves the shear device and its hydraulic rams up and down.
The device stopped instantly when Seamus lifted his foot off the operating pedal.
In terms of hydraulic power, Seamus added: "I would recommend a very small tractor because it doesn't need huge hydraulics to drive it."
Seamus reckons his machine is ideal for forestry thinnings, especially now increasing numbers of bogs are closing.
"You could cut down a whole tree and bring it to the machine, run it through and pick up the bag the other side when you are done and go home," he proudly stated.
Prospective buyers can see Seamus's invention at this year's Tullamore Show, as he has once again entered it into the inventions competition.
Seamus has priced the log-shearer at €3,500, plus VAT.
This includes both splitter and shear function, plus comprehensive training.
Seamus can be contacted on 087 2119565 or by email at email@example.com