Hi, I've auctioned a Jupiter 9 with a variety of adapters. At its core appears to be a 39mm thread mount (as added to the description further down by the seller). An LTM to M adapter fits just fine - but when trying to mount the lens on an M body the bottom of the barrel would interfere with both, bayonet lock and preview lever, being of 58mm in diameter. Now, has anybody successfully mounted this lens on an M body - and if so, how? Additionally, I wonder whether the focus cam would work correctly....? Thanks for your input.