13 Tooth Sprocket For Type 1 Rotary Drive

[baysailor34]

The shaft on the Type 1 Rotary Drive requires a sprocket with a 5/8" bore and a 1/8" key. The Raymarine sprocket part number is M81182. I can't find that sprocket anywhere. I searched online and found nothing. I called Defender and WM and neither have it available. Defender told me it's a part no longer made by Raymarine. I went to other sources of sprockets but all of them that are 5/8" bore have what is a "standard" 3/32 key slot for that size bore.

Can I use a sprocket with a 3/32 key to fit onto the shaft that has a 1/8" slot without encountering future problems?

Thanks,
Joe