Since I was unwilling to pay $739 (the sale price on eBay) for a correctly dated jack for my '67, I bought a dated repro from LI Corvette. All the vendors caution about using the repro to actually jack the car, saying it's just for show (although LI's disclaimer is milder, saying it's not a 'modern' jack). The jack looks sturdy enough to me; are these disclaimers just legal CYA and are they okay to use if I have a flat? Thanks.