Barrie, I reinforced the crank pins (silver steel) on my Sweet Pea (cast iron wheels) with 4BA socket grub screws. I thought drilling and tapping might be a problem, but in practice it went fine. I always prefer socket to slotted grub screws bcause they have less of a tendancy to open out and jam. Regards, JohnP >. Could >be a bit tricky to drill the holes but it will give that extra peace of >mind MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.