Hi George,
Glad we see eye to eye, looking back at my post it was a bit snotty! My apologies for that. Your system is fine for the odd engine. However I have recently been befriended by a young lady, all of 8 years old, who wants to become an engineer! Great! I showed her how to build a Cox reedy from my stock of spares. She then built up another two by herself! It is bitterly cold here in my part of the UK, but she wanted to fire them up, so we used your system and fired them up outside. By the time we had run the last one, we didn't think much of the screw system, hands like blocks of ice! Mind you she was so pleased, that we are going to build a trainer and a Combat Kitten for her two engines. Made an old man feel good! Hope she can learn to fly them in the spring.
Regards,
Andrew.