Hi Ghougary, I don't think plaster is overdamping, it being fairly neutral and non-absorptive. Give it a go! As to the bias weight, biasing is not an exact science, as the force actually changes as the needle travels across the LP, there is no absolute value. So I think the Lenco weight would be perfect, actually close to the size/mass of the original, which is quite small. Been really busy these days, but will be back with yet more Idler Impressions later ;-).
Had been away from home the last few days, and played Pink Floyd's The Wall, and while I was drinking pop from the bottle (bad me), I almost swallowed the bottle when the Lenco Dynamics came suddenly slamming out from a quiet introduction!! Forgot just how SLAMMING the Mighty Lenco/Idler was!! The words are "speed stability", true, in-practice, actually-playing-a-record, Speed Stability. There goes the one musical advantage digital has over vinyl! Back later for more ;-).