Go Back to him and explaint the situation... Sold as seen is not that, the seller has a legal right to resolve any problem upto 14 days from sale (IIRC)... and dealers are 30 days.. or offer you a full refund.
Call him upo and explain it's not a clutch its a box and ask nicely what he wants to do.. But also get your rights squared away first as my memeory's a but vaugue about this.