Hi Nigel,
Nice to hear from you. Going back, my original shutter was certainly not designed for automation and I had to modify it so much to make it run nice and smooth & also to ensure it keeps aligned to contact the limit switches. The motor is a Chinese clone, purchased on Ebay and unfortunately I have no details to hand. I will investigate and report back. I didn't want to buy an expensive motor as, to be frank, I didn't think I could modify the shutter to be able to motorise it. The motor has enough guts to driver the shutter, but kept slipping on the drive belt, due to flex in the shutter and I've had to add some modifications to enable it to run smoothly.
The two rollers stop the shutter from lifting due to the pressure between the drive gear and the drive belt.
Automating the shutter is still an on-going project. I have built Hugh Gillespie's Magic Wire project and I have installed it in the Pulsar. I have it opening and closing the shutter, but, I'm having issues with the limit switches not working as they should.
I have attached the Magic Wire manual for your perusal. If you need any addition information please do not hesitate to ask.
Steve
Magic Wire Manual.pdf