Hi there, i bought a vendo 407 on ebay for our office, and once it arrived (and managed to get it up the stairs) i realised it didnt have a coin mech. i thought i could get it into free vend, and bypass this, but it doesn't look like i can?

When i turn it on, it presents an error identifying that the bill validator/coin mech is missing. 

Ive looked at getting a cheap coin mech, but im not sure what is compatible (any mdb mech?) and cant seem to find any secondhand ones in the UK?

Could anyone help me with this and tell me if i can bypass the mechanism completely, or where i can get a cheap coin mech that i can hack some how to put it into free vend, or similar.

Cheers