You can only get so excited about butt rests, but these little beauties are fantastic. 

They’re spring-loaded butt grips that come with two sets of arms that can be interchanged, the larger accommodating Duplon or cork handles and the smaller, shrink-wrap and other slim handles. These can be changed quickly and easily on the bank; just don’t lose the small spring inside the rest. Not only do these grip any handle securely, but they do not cause damage, a particular concern with Duplon and cork handles. The torque ring enables the rests to be lined up perfectly on buzz bars, or it can be removed for use with single sticks.
Jon Bones

Quick Lock Butt Rests
RRP: Single £5.99; pack of three £14.99