Houdini said he would open the handcuffs from the afterlife, if he could.
"They were very important to my father," says Radner. "He bought them from Harry's brother, Theodore, who performed as Hardeen, and were first used in a séance in 1948."
Until 1995, the official Houdini séance was held at his graveside in New York's Machpelah cemetery.
It has since taken place around the United States as well as in London and Montreal.
Great escapologist, but he couldn't drive
"Harry was an amazing guy," says fan and "Inner Circle" member Tom Boldt, a construction executive from Wisconsin.
"There wasn't much he couldn't do. Except perhaps drive. He was the first man to fly a plane in Australia. In 1910. He even toured in Russia.
"The séance has become part of Americana. It's an opportunity to retell Houdini's incredible rags to riches story. And another serious attempt to honor Houdini's claim that if anyone could return from the hereafter, it would be him."
Fellow table member and séance host Bruce MacNab from Dartmouth, Nova Scotia, wrote an award winning book, "The Apprenticeship of Harry Houdini," about The Metamorphosis, Houdini's tour of eastern Canada.
He spent five years researching it.
"Houdini spent a month in the area and stayed in the Carleton House in Halifax," says McNab. "He discovered the straitjacket on the tour.
"His show at Yarmouth was his first one outside of the U.S. And the one in Dartmouth his first international one as a headliner."
Along with Frank Lloyd Wright, Senator Eugene Macarthy and Liberace, Houdini is one of Wisconsin's favorite sons.
His hometown of Appleton, two hours north of Milwaukee and one hour south of Green Bay, offers self-guided walking tours around Houdini-related sites, like the Houdini Elementary School.
The school motto is "The Magic of Learning. The Magic begins here."
There are the Houdini Escape Gastropub and the Stone Cellar Brewpub, which serves "Houdini Honeywheat" or "Weiss" beer.
From shoe shiner to crowd pleaser
Born Ehrich Weiss in Budapest in 1874, Houdini spent the first nine years of his life in the Wisconsin town now famous for dairy farming and a fire engine factory.
Appleton boasted the United States' first enclosed shopping area and the country's first hotel with electrified lighting. And first hydroelectric plant.
Houdini's father, Samuel, was the town rabbi. He preached above Heckert's Saloon, now a carpet shop and bridal outfitter. The family home is now a shopping plaza.
The only physical landmark left from Houdini's boyhood is the wooden Temple Zion synagogue at 320 North Durkhee Street, which was built around the time Rabbi Weiss was sacked from his $750 a year job for not being able to preach in English.
The family moved to Milwaukee in 1883.
Houdini and his brothers shined shoes and worked as newspaper boys for the Milwaukee Journal.
Their father became a kosher butcher.
Houdini took his name from the French illusionist, Robert-Eugene Houdin.