Postby Mogas » Tue Jun 26, 2007 2:00 pm
Hi Bennie
On the spinner backplate there should be a mark made by a drill exactly in the middle. If you can't find it, take the backplate to a machine shop and ask them to index the centre for you.
Next carefully measure the distance between opposite prop mounting holes on your motor. Centre to centre. Measure it again, and again.......you get the picture, it's important. Then halve this measurement to get the radius from the centre of the back plate to the mounting holes. Use a compass, scribe a circle on the backplate. Devide this circle into however many prop bolts there are (6 I think). You can use the compass again, trial and error, till you get the correct spacing.
Now you have your prop bolt holes located. Drill the holes to the correct size.
Next cut out whatever clearance centre is required, I used a big drill first then a series of flapwheels till the hole was sized.
Lastly but very important: some of the older spinner kits had a very flexable back plate. If in doubt stiffen it up. I epoxied and riveted an alluminium plate onto mine. See picture. Just remember, measure twice, cut/drill once and you will be fine.
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