To avoid any trouble at all? Including your mother having to go through hell when returning? Buying from a Canadian Retailer would be the safest thing to do (and since your own mother is involved, the smartest thing to do).
I know it's probably not what you want to hear, but why would you put your own mother at risk???
Edit; yes, a few parts maybe, like springs and gears, but those you can get in Canada anyway. Customs has been known to go nuts over stranger things. Being accused of smuggling is not a trivial charge; personal luggage is well scanned.
Last edited by Greylocks; February 17th, 2007 at 19:10..