So my Nana gave me my Gramps' Pocket Ben he's had as a work watch, but the chain loop on the top is missing. I took it to my local watch repair and they said that you can't replace that loop (I think it's called a bow?) on any watch because "it won't have enough tension". Is this true? Because I'm pretty sure I've seen replacement ones on eBay and Amazon, but I don't want to order any if I can't actually put it on.