I've done some work on the primitive and I thought I'd do a demo' video showing how the wood starts to move once it gets hot.
It's surprisingly quick for it to relax, become pliable and start to move under some weight (a brick tied to the end!), but a word of warning, if you want to bend it and for the bend to stay fixed in, it needs heating for longer.
After filming the demo, I re-jigged it and gave it another 10 minutes of heat to take out the deflex tip.
I'll see how it is on the tiller later on. It may need some lateral bend at the grip as the string alignment is marginal at the moment.