Long Rests - Half Butt & Full Butt
The Extended Spider and The Swan serve similar purposes. Both enable players to reach a cue ball which is the other side of a group of balls - for instance the pack of reds in Snooker. In such cases, even a spider will not adequately reach the cue ball and so either an Extended Spider or a Swan is the requisite tool.
The difference in functionality between the two is subtle but the Swan will give a greater height so is useful where the cue ball is a distance away and it is desirable to approach it at a steep angle. The extended spider has a slightly greater reach and is sometimes found on a longer shaft - see the Long Spider section below.
The Long Spider
Finally, a bit of thought reveals that even with all of the above, there is still a gap in the rest market - what happens if you need the extra height of a spider and also the length of a half butt? Although it may seem a bit OTT, it does occasionally happen that the cue ball ends up behind a ball at the far side of the reds and you need to cue over it from the baulk end of the table...
For this reason, some snooker clubs make available a rest called a 'Long Spider'. This is normally a Half Butt length shaft with a spider rest head.
For similar reasons (in the case where you need to cue over several balls from the baulk end of the table), one does occasionally see an extended spider rest head fitted to a half butt shaft. Generally speaking, these more obscure long rests are only seen at larger snooker clubs. If you would like to buy a long spider, contact us for a price...