Another idea hit me over the weekend.
The rear sliding portion of the sidescreen has a narrow trough in front of it, into which the front plastic window is secured with clear silicon sealant.
Closer look - difficult to show clearly.......
COH Baines sell angle neoprene (L shaped with one leg thicker than the other) - reference IRS0822EP at £1.06 per metre......
The thick end slots in the trough and the thin leg fits close to the sliding window. This means that when it's wet, much less water can get in that slot. I've fixed it at each end with double sided tape. Although the tape doesn't stick well to the neoprene (due to the waxy release agent I suppose)- it helps to hold the seal in the trough. Just a small piece at each end.
Close up with flash (sorry about that dust........)
The only tricky bit is that there was some silicon residue at the fixed window end which took some shifting so the seal could fit properly. But this is a nice and easy quick cheap fix.
And one day it will get wet again.......
