it is simple post on his wall and then message him ,,,,,(use your free pass on your first game for xp points )you could even tell him where to find it ,,if he does not respond kick him out of the cc .... personally i give them a month or so to contribute then remind them then they are gone
PS you stated that you wished you could remove his putter pal well thats also a simple task remove him from your cc then he no longer has it ,,,,dont know what answer you are looking for but you have quite a few options from people in these posts