After your excellent video , may I endorse the review. I have two 120s in service, both utterly superb engines, one in a PST Revision, the other in a Reaction, . Apart from possible starter/ generator combos. (A ‘ la Jet Cat) impossible to suggest any improvement. I now have 5 of Gaspar’s engines, 45, 85, 100, all superb. Engineering quality of the highest standard, like Porsche BMW , what ever HH might think !