Hi Gonzo, sounds like you inherited the same issue we did. Worn out starter motor. Early on after buying our Clipper (CHB) 34, we were out on our shakedown cruise and started having trouble getting the starter motor to kick in. I found I could usually get it to go if I got the SO to turn the key while I tapped madly at the region of the solenoid on the starter motor, which on the Lehman 120, as you would know, is on the left front of the engine, so the floor had to come up for this. Well doing it at your leisure, and when not entertaining - or encountering nasty weather, is one thing, but when it happened one night when we anchored in serene calm, only to be caught in an unforecasted Southerly buster, dragging anchor on a lee shore and down to 1 metre depth, (at 0.6m I'm touching bottom), with white water breaking round us....well that was another matter....
Imagine, dragging anchor - dark as pitch and pouring with rain with be-all visibility, also no GPS at that time, and the damned starter decided to hissy-fit again. Up with the floor - tap tap tap - finally, with great relief, it started. The rest of the ride out after upping anchor, (another time the plough was letting us down, incidentally), and then navigating to shelter just using barely visible lit beacons - well it was quite exhilirating actually, (adrenaline probably), but the starter issue I could have done without. First job after that - reconditioned starter motor. Starts first blip every time now. The anchor - that's another story - see the thread on the '4 best innovations'.