Awe! Did you buy it direct from them? Either way just send them a message through the contact form on their site. I would be surprised if they didn’t just mail you a replacement nub for free. Congrats on your new OP-1, sorry for the rough start! It’s a tonne of fun though. Welcome to the forum!
It’s a handy lesson actually, based on the amount of GAS generated pre-purchase, a minor “let down” like this teaches me not to over-invest on how marvellously perfect it will be to acquire things, even though it is still marvellous.
I sent head-office an e-mail and await their reply.
A replacement nub would be nice.
Otherwise, I may just have to put 4 new alien feet on it from the hardware shop.