So I've dismembered Liftoff and got it to a shell again in preparation for the rebuild - one thing is bothering me tho. When I first put it all together I used normal chipboard wood screws to join the HDPE parts together - now I'm not convinced they'll re tighten as much as they used to do.

I had read somewhere on the forum that you could use wood inserts for better results. Now I've had a look on ebay and found what I need, just want to know what size you recommend, I'm using 10mm HDPE so the insert must fit within the thickness...

These are what I was looking at these two, both fit within the thickness, but the screw size is different

http://www.ebay.co.uk/itm/M3x12mm-Slott ... 3f0c4473b0

or

http://www.ebay.co.uk/itm/M4-x-10mm-Unh ... 4169c14f67