I have a lifeboat with a Lister ST2 coupled up to a LM100 manual gearbox. The reverse gearbox needs freeing-up or replacing. I have had advice to sort this out .....draining oil applying heat, vinegar, etc. At the moment this does not seem to work so I may have to replace it (I can't find a second-hand unit for sale anywhere). I am absolutely amazed at the prices being charged by the specialist companies for an exchange unit, ie... Including v.a.t. prices I have been quoted range from approx £850 to £1100 and this is for the reverse gear only. For the reduction box as well £1200 to £1450. (These are hardly in the vintage category, and a vast quantity were made). It is almost makes sense to buy a replacement s/h Lister perhaps even with a Lister LH150 hydraulic box. I would be interested if anyone has any views on this