That's a nice looking little track. I imagine your son loves driving round that.
I notice the screws holding the perspex have split the MDF. Whilst this is not a problem usually, it does look a bit ugly. The secret is to clamp the MDF before you drill it and use a drill only marginally smaller than the full diameter of the screw thread. Use longish screws so that they get as much grip as possible within the hole and longer screws also support the perspex better if someone leans against it.
To rectify the existing problem you could try sqirting some woodglue down the hole, clamping and re-drilling, if it bothers you as much as it would me.
I've just noticed all the smileys have been jumbled up again!
I notice the screws holding the perspex have split the MDF. Whilst this is not a problem usually, it does look a bit ugly. The secret is to clamp the MDF before you drill it and use a drill only marginally smaller than the full diameter of the screw thread. Use longish screws so that they get as much grip as possible within the hole and longer screws also support the perspex better if someone leans against it.
To rectify the existing problem you could try sqirting some woodglue down the hole, clamping and re-drilling, if it bothers you as much as it would me.

I've just noticed all the smileys have been jumbled up again!
