meade expert
19-08-2007, 05:04 PM
Hi All
For those with broken SBIG ST4 disicannt rings there is a way to manufacture a replacement.
The ring is 33mm by 23mm by 4mm thick. It is in technical terms an ANNULUS.
Surprisingly....there are at reject shops some stickytape plastic inserts that meet these dimensions almost exactly.
They are 33mm by 25mm by 10mm thick. They have a channel that is 2.2mm wide and 3mm deep (thats where you can pack tiny silica gel beads !)
So what you do is sandpaper down the ring till its about 3.5mm on its shallowest end and pack the beads into the deeper end, leaving a 0.5mm gap for air to get into the beads once it has been inserted into the nose piece slot.
Voila ! your replacement ring....and it works well!:D
For those with broken SBIG ST4 disicannt rings there is a way to manufacture a replacement.
The ring is 33mm by 23mm by 4mm thick. It is in technical terms an ANNULUS.
Surprisingly....there are at reject shops some stickytape plastic inserts that meet these dimensions almost exactly.
They are 33mm by 25mm by 10mm thick. They have a channel that is 2.2mm wide and 3mm deep (thats where you can pack tiny silica gel beads !)
So what you do is sandpaper down the ring till its about 3.5mm on its shallowest end and pack the beads into the deeper end, leaving a 0.5mm gap for air to get into the beads once it has been inserted into the nose piece slot.
Voila ! your replacement ring....and it works well!:D