Estes Mini Bertha Clone, #TK-3, Part 7, Gluing On The Fins With No Wobble!

Well, I did it again! This is a missing, out of order post, 

It's an important one, showing how to get rid of standing wobble of four finned models. 

Here's post #7. I'll put them into correct order in a few days.

 

Extend the fin position lines under and onto the centering ring.

I also mark the intersection of the root edge and trailing edge on the fin itself. It gives me another alignment point.

I've scraped the glue lines for the four fins and the launch lug.

After scraping the pencil alignment lines are redrawn.

TIP: Four fin rockets can wobble when standing up on the fin tips. To fix this - 

Glue on three fins. The model might stand up by itself now, but can tip over.

Apply glue onto the root edge of the fourth fin.

Set the root edge on the pencil line.

While the fourth fin glue is still wet - You can slide the fourth fin up or down. 

Set the fin and check by standing the model on a tabletop. 

Pay attention to the last glued, fourth fin position. By making slight up and down movement on the fin down the alignment line you should find the spot where the model will stand on all four fins without wobbling.